Ennis was an antagonist and a supporting character in Season 3 of Teen Wolf. Just like fellow Alpha Kali, he was first introduced as a nurse who seemed intent on capturing Isaac Lahey from Beacon Hills Memorial Hospital. However, when Scott McCall caught him trying to take an anesthetized Isaac out in a wheelchair, the two engaged in a fight in the elevator that revealed that Ennis was, in fact, an Alpha Werewolf. Later, he was shown fighting against Braeden with the rest of the Alpha Pack, led by Deucalion.
He spent the first part of the season working with his pack to manipulate Derek Hale into joining the Alpha Pack, which culminated in a battle at an abandoned mall that resulted in both Ennis and Derek being seriously injured after falling three stories and landing on an escalator. Ennis was brought to Alan Deaton's animal clinic by Kali, Ethan, and Aiden to see the veterinarian's help in healing him. Despite Ennis' grave condition, Deaton was able to save him, but it ended up making no difference-- Deucalion, seeing an opportunity to manipulate Kali into forcing Derek's hand, smashed Ennis' skull with his bare hand so that the rest of the pack would go after Derek.
Not much is known about Ennis' early life, such as whether he's a born Werewolf or a bitten one. However, it can be assumed that he killed an Alpha and became one himself at some point in his life before building his own pack.
In the early 2000s, he and his pack attended a summit in Beacon Hills with Talia Hale and the Hale Pack, Deucalion and his original pack, and Kali and her original pack. At some point at the beginning of the summit, one of Ennis' Betas was shot in the throat with an arrow by ArgentHunters before being tortured through removal of his claws and killed by being cut in half. When the Alphas and their packs convened at the abandoned distillery, Ennis announced his Beta's death and urged the other packs to assist him in retaliation; however, since it had nothing to do with her pack, Kali had no interest in being involved, and though Talia agreed that it was Ennis' right to get revenge for the loss of his Beta (which was seconded by her daughter Laura, who argued that Hunters don't discern between packs and that they were all at risk from the Argents), Deucalion argued against further bloodshed, insisting that it wouldn't end at "an eye for an eye." Despite Deucalion's argument, Ennis made it clear he was intent on revenge by carving a spiral into the corrugated metal wall of the distillery with his claws.
The next day, Ennis showed up at Beacon Hills Memorial Hospital to try to retrieve his Beta's body, but then-Deputy Noah Stilinski stopped him, reminding him that the case into how he died was still being investigated, and that, even if it wasn't, Ennis wasn't his biological family and thus had no claim to his remains. Though Ennis was angered by this reaction and physically threatened Stilinski, he didn't fight back out of fear of exposing his supernatural identity.
Some time later, Talia's brother, Peter, convinced Talia's son Derek that the best way to ensure that his girlfriendPaige Krasikeva wouldn't leave him upon learning that he was a Werewolf was to turn her into one as well, making her strong and healthy and giving her a longer lifespan. Knowing that Talia would never do it and wanting to take advantage of the large number of Alphas currently in Beacon Hills, Peter recruited Ennis to give Paige the Bite, as he knew Ennis needed to fill the hole in his pack caused by his Beta's death. However, though Derek changed his mind at the last moment and tried to intervene, Ennis easily overpowered him and showed him it was too late-- he had already bitten Paige. Paige ultimately rejected Ennis' bite, which meant that Ennis was still short a pack member.
After Deucalion's attempt to forge a truce with Gerard Argent ended in a massacre that killed several of his Betas and left him blind, another one of his Betas, Marco, attempted to challenge him for his Alpha status. Unfortunately for him, Deucalion was able to kill him, causing him to learn that an Alpha can steal the powers of his Betas, making him stronger and more powerful in the process. After Deucalion, corrupted by the power rush he received, killed the rest of his Betas to steal their power, he invited Kali and Ennis to join him, with Ennis becoming the first to join the newly-formed Alpha Pack by killing his own Betas and Emissary. ("Currents")
In Tattoo, Ennis, disguised as a employee at Beacon Hills Memorial Hospital, pushed an unconscious Isaac Lahey on a gurney out of the operating room before then putting him in a wheelchair. However, when he pushed Isaac into an elevator to leave, he was caught by Scott McCall, who extended his claws and fangs and rushed to fight him, barely making it through the closing doors. They both shifted into their Werewolf forms and began to fight, which revealed to Scott that Ennis was an Alpha. Ennis quickly overpowered him and held him in a choke-hold as he growled, "Don't you realize who you're dealing with? I'm an Alpha!" Fortunately for Scott, Derek Hale appeared just in the nick of time and impaled Ennis in the back with his claws, retorting, "So am I" before throwing him out of the elevator and far down the hallway.
Ennis was not seen again until the end of the episode, when he, Deucalion, Kali, and the twins flooded into the boys' locker room at Beacon Hills High School, where they attacked Braeden on Deucalion's orders. Despite Braeden being a human, her fighting prowess was still strong enough to hold her own against Ennis, and had it not been for a well-timed spinning kick to Braeden's face by Kali, slicing her with her tow-claws, she would have defeated him. Ennis then watched as Braeden informed Deucalion that she knew he feared Scott due to what he would become (a True Alpha) before he responded by clawing out Braeden's throat.
In Unleashed, Ennis, Kali and Deucalion broke into Derek's loft as part of Deucalion's plan to manipulate Derek into joining the Alpha Pack. Ennis opened the sliding door to the loft and was immediately targeted by an enraged Cora, though Ennis was able to easily stop her in mid-lunge and pin her to the floor by her throat. He then looked up at Derek with a grin and asked him if he was ready for a rematch, referencing their earlier fight in Tattoo. After Kali defeated Derek by impaling him in the chest with a lead pipe, Deucalion came in and began his pitch to get Derek to join their pack by insisting that both Kali and Ennis killed their own Betas and Emissaries in order to do the same. When it became clear that Derek would not humor them while Cora was in danger, Deucalion instructed Ennis to let her go as a sign of good faith. Ennis then left with Kali and Deucalion several hours later with the ultimatum that if Derek didn't kill his own pack and join them, they would come back and kill them all.
In Frayed, Ennis, along with Kali, Ethan and Aiden, accompanied Deucalion to an abandoned mall where he was planning to have a diplomatic discussion with Scott McCall and Isaac Lahey. However, when it became clear that Derek Hale, Cora Hale, and Vernon Boyd had come to ambush the Alpha Pack without their knowing, Ennis and the others came out of the shadows and began to fight them all. Ennis went after Scott and Isaac, breaking Isaac's arm before throwing Scott so hard against the stone wall that it broke a huge piece off of it. He then dragged the two young Betas to the center of the room, where Boyd and Cora had also been defeated, to await further orders from Deucalion. Deucalion then ordered Derek to choose between killing Boyd or killing Cora, insisting that he would be killing one of his packmates and stealing their power as part of his initiation into the Alpha Pack.
Fortunately for the Beacon Hills Werewolves, Allison Argent arrived and began shooting flash-bang arrows at the pack, temporarily blinding Ennis with the mini-explosions as Deucalion shouted at them to cover their eyes. With the Alphas disoriented, the Beacon Hills Werewolves were able to get the badly-injured Boyd out of the line of fire before they engaged in battle once again. Derek went straight after Ennis, with the two fighting on even grounds for quite a while as they unintentionally moved closer and closer to a large hole in the floor. Scott, afraid that Derek would be overpowered, crawled across the floor toward them and used his claws to slice Ennis' Achilles tendon. He became so unbalanced that he toppled over the end of the hole in the floor and pulled Derek down with him, causing both of them to fall three stories before landing on an escalator below.
Both were initially believed dead by the young Beacon Hills wolves, but Derek and Ennis ultimately survived their fall, though with critical injuries. Ennis was rescued by Kali and Aiden, who, accompanied by their Emissary Marin Morrell, took him to the Beacon Hills Animal Clinic to demand that Alan Deaton heal him. Though Deaton was reluctant to help the Alpha Pack, Deaton ultimately did as he was asked after his sister, Marin, reminded him that if Ennis died, the Alphas would go after the kids even harder, and neither Derek nor Scott would be safe from him. Deaton was successful in stabilizing Ennis' condition, but in the end, it did not matter, as Deucalion, sensing Kali's lack of enthusiasm in their mission to recruit Derek due to her belief that he was only a leader to a pack of pathetic teenagers, killed Ennis by smashing his skull to give her incentive to go after him by blaming his death on the injuries Derek caused. Kali was so devastated by Ennis' death that she went out into the parking lot and roared so loudly that the vibrations from her voice triggered the alarms for all of the cars parked around her.
In Motel California, Ennis was mentioned by Ethan when he informed Scott that, since, from what they knew, Derek had killed Ennis, he was now given an ultimatum with two choices-- he could either kill his Betas and join the Alpha Pack as an Augmented Alpha, or he could be killed by Kali.
In Currents, when Kali came to Derek's loft to fight him as warned by the Alpha Pack symbol she painted on his windows, she revealed that when he "killed" Ennis, she was so furious that she wanted to just go for it and kill him right where he stood in retribution. Despite this anger toward him for what she believed to be Derek's murder of the man she loved, Kali still gave him the choice of killing his pack and joining them or having her kill all of them, and even made Derek kill Boyd by forcing his claws into Boyd's chest after he was so badly electrocuted that his regenerative healing ability was disabled.
In Visionary, Ennis appeared in flashbacks to the early 2000s, before the creation of the Alpha Pack, where he and his original pack attended the Werewolf summit hosted by Talia Hale and the Hale Pack that included Deucalion, Kali, and their original packs as well. During this time, one of his Betas killed two ArgentHunters, though whether it was intentional or an accident caused by losing control over his transformation remains a mystery; regardless, this caused the Argents to retaliate by shooting him in the throat with an arrow, bringing him to the abandoned distillery, torturing him by pulling out his claws one by one, and finally cutting him in half with a broadsword to kill him.
Ennis, both furious and devastated by the loss of his Beta, informed the Werewolves at the summit about what had happened and urged them to help him get retribution on the Hunters for what they had done. This request received mixed reactions: Kali claimed to see no reason why she should concern herself with the death of a wolf who wasn't even in her pack; Laura Hale argued that since Hunters don't discern between packs, it was a threat to all of them; Deucalion insisted that violence begat violence and begged Ennis to take a diplomatic approach; and Talia ruled that, since Hunters were not the only ones who adhered to a Code that was hundreds of years old, Ennis had every right to avenge his Beta. Ennis, unimpressed by the lack of support he got from the other packs, dismissed Kali and Deucalion's responses as "useless debate" before making his intention for justice clear by carving a spiral (the Werewolf symbol for "revenge") into the corrugated metal wall with his claws.
Ennis was then seen at Beacon Hills Memorial Hospital, where he attempted to obtain the body of his Beta in order to lay him to rest. However, when Ennis became a little too aggressive, then-Deputy Noah Stilinski stepped in and politely asked him to back off before reminding him that not only was an autopsy still being performed to identify the killer, but since Ennis was not his biological family, he had no right to claim the victim's remains. Angry, Ennis insisted that they were family and stormed away.
At some point while Ennis was in Beacon Hills for the Werewolf summit, he was approached by Peter Hale, Talia's younger brother, on behalf of her son, Derek, who Peter had convinced to have one of the Alphas give his girlfriendPaige Krasikevathe Bite; since Peter knew that Talia would not turn someone without their consent and Ennis had recently lost a Beta, Peter believed him to be the perfect choice for an Alpha to turn Paige, and he led Ennis to assume that doing so would get him into Talia's good graces. However, at the last moment, Derek lost his nerve and tried to prevent Ennis from turning Paige by fighting him, though Ennis' immense size combined with Derek's youth and inexperience made it almost effortless for Ennis to defeat him and reveal that it was too late-- he had already given Paige the Bite. Unfortunately for all involved, Paige ultimately rejected the Bite, forcing Derek to mercy-kill her where he was hiding her in the root cellar under the Nemeton. Unbeknownst to Ennis or anyone else at the time, it would be this unintentional virgin sacrifice that allowed Jennifer Blake to survive her mauling at Kali's hands and begin her plan for revenge against the soon-to-be-formed Alpha Pack.
Very little of Ennis' true personality was revealed as a result of his short time on the series, but the little he was seen in the series indicated that Ennis was the "strong and silent"-type who preferred to rely on his physically-intimidating appearance to aggressively frighten and persuade others to do what he wanted. He was shown to be extremely loyal to his pack and Deucalion, to the point where he killed all of his own Betas and his Emissary without reservation as his initiation into the Alpha Pack. This willingness to do anything for his leader in addition to his physical strength and enjoyment of violence made him a perfect soldier in the Alpha Pack and was likely a major factor in why Deucalion recruited him in the first place. He was implied to have a romantic relationship with fellow packmate Kali, suggesting that he may have had a softer, more caring side that he was unable to demonstrate prior to his death.
Before he was convinced to join the Alpha pack, he was originally shown to deeply care for his Betas, having sworn vengeance on the Hunters for the murder of one of his own.
Ennis was a 6'4" giant; not only was he tall, but he was very muscular as well, making him even more powerful than a typical Alpha. When shifted, his eyes did not resemble that of a typical Alpha-- instead of manifesting glowing bright red irises, his irises were blood red, glowing dully with a dark black ring around the outer rim, just like his packmate and presumed lover, Kali.
Ennis possessed all of the standard weaknesses associated with Werewolves, including Wolfsbane, Mountain Ash, mistletoe, electricity, and the lunar eclipse. He was also somewhat vulnerable to the effects of intense emotions and the full moon, though, as an older and experienced Werewolf, he was able to resist the effects much easier than younger ones.
Ennis: Ennis is an Anglicized form of the Gaelic surname Ó Aonghuis, meaning "descendant of Angus." Angus itself is an English form of the Irish and Scottish Gaelic name Aonghas, composed of Celtic elements that mean "one" and "choice," a fitting name for Ennis, who made the choice to betray his original pack by killing them and joining Deucalion's Alpha Pack.
He was presumed to be in a relationship with Kali.
It has been implied that Ennis was the first person to join the Alpha Pack after Deucalion created the idea of it.
He is the only Alpha so far in the series who has had a human die from their Bite rather than being turned, as evidenced by Paige Krasikeva rejecting his Bite and having to be mercy-killed by Derek Hale in the early 2000s.