Aiden, as well as his twin brother Ethan, is a born werewolf. Both brothers have the talent to merge into the form, the Voltron Wolf. In Season 3, Aiden, alongside his brother, has alpha status and are part of the fearsome alpha Deucalion's Alpha Pack. The alphas are present in Beacon Hills, California to assault and coerce local alpha Derek Hale into joining them and later attempt to recruit Scott McCall after his potential to be a True Alpha is revealed. As their part of the mission, Aiden and his brother enroll at Beacon Hills high school as a new student to seduce and start an affair with Lydia Martin to sabotage Scott and Derek. Aiden follows and carries out Deucalion's orders to undermine the local pack members without question all while sleeping with Lydia, but after he helps murder Vernon Boyd, she confronts him and he displays remorse. Aiden and his brother use Voltron Wolf to battle Jennifer Blake, the Darach, but they lose. The twins survive but lose their merging talent, alpha power, and they regress to omegas. Aiden and his brother decide to stay in Beacon Hills and atttempt to join Scott's pack, but Scott refuses. Aiden continues his liaison with Lydia but he shows more of a conscience when she labels him a bad guy. Aiden and his brother become allies to Scott's pack against the threats of the oni and Stiles Stilinski being possessed by the Nogitsune. Aiden and his brother take Derek's advice that to become part of scott's pack, they fight for his cause, standing with them against the nogitsune to save Stiles' life. Aiden and his brother fight off the oni and manage to destroy them but Aiden is killed. Aiden dies being held by Ethan, humbled that he did good.
More spontaneous than Ethan, Aiden is impulsive, aggressive, cocky and prone to violence. Though the more bloodthirsty of the twins, Aiden does care for his twin and eventually shows remorse when Lydia tells him he is a bad guy. Like his brother he has a sense of honor, as he displayed fealty towards Scott's allies for their conflict with the Alpha Pack.
- English, with Ethan and Scott
- Biology, with Lydia and Danny
At night, Aiden and Ethan are out on the streets of Beacon Hills, attempting to recapture their escaped target teenage beta Isaac Lahey who had been rescued from the alphas' lair back at the bank by the mercenary called Braeden. They pinpoint their targets' location and move on a high-speed chase through the streets.
Aiden and his brother manage to back her into a dead end, Ethan charges in and Aiden attempts to scare their enemy into submission by taking a high jump to the sky and descends down towards them, but Braeden changes out onto a side-road and the alpha's punch lands in the granite cracking it. Isaac, however is growing more and more drowsy and exhausted having been beaten very badly.
The chase continues throughout the district until the twins chase Braeden's bike through a window. Isaac, exhausted droops on the woman's shoulder and they fall to the ground. Isaac attempts to get back up. Aiden and his brother then move in on their targets, walking in tandem, zeroing in on the weaker wolf. The twins continue to advance on Isaac determined to snatch him and bring their hostage back. Claws out, they rip off their tops, about to merge to raise the steaks for Isaac and Braeden. Isaac can only just crawl and resolutely stares back at his tormentors. The twins instead keep marching on.
Seconds later after withstanding the backlash of the merge the twins stand before Isaac and the injured mercenary as Voltron Wolf. Snarling, they move in to attack Isaac and Braeden, knowing their exponential strength now far surpasses his.
However, Braeden comes to, and shouts at Isaac to duck, while Ethan and Aiden rush forward with their attack. Braeden fires her modified military grade taser, and an electric bolf hits the Voltron Wolf square in the chest. The merged wolf falls back from the shock, spliting back into two separate individuals. In the electrical flash, Aiden and Ethan however, recover before Braeden and Isaac can regain their senses.
They also lie in wait for Braeden to possibly show up, prepared to alert the other alphas should she ever show up.
The twins with the rest of the alphas chase Braeden down, corralling her into the high school. All five superpowered alphas attack the mercenary who puts up a good fight nonetheless, but they eventually bring her down. They then hand Braden off to Deucalion.
Aiden and Ethan attack Isaac and then frame him for attacking them. Isaac and Scott mess with their motorbikes for revenge. The Twins merge into one to take them on. Deucalion shows up at the school and the twins stop.
Aiden is shown in flashbacks during the fight between the Alpha Pack and Derek's pack. He is also shown in a flashback making out with Lydia. He later helps Kali get treatment for Ennis by Deaton. He comforts her after Ennis dies.
Aiden is first seen in the episode making out with Lydia. Later, both he and Ethan hold Jennifer captivae during the attack on Derek's loft. They help with the killing of Boyd while there.
Aiden tells Ethan to stop talking to Danny. He is later seen making out with Lydia until she confronts him about killing Boyd. Aiden fights with Cora in the changing room until Ethan and Scott stop him. Aiden is seen at the concert with Ethan.
Aiden and Kali go to kill Derek iin his loft. Ethan and Lydia go to convince them not to. While there, Jennifer shows up. The twins merge together and attack Jennifer. She breaks their neck. Deaton manages to save Aiden and Ethan. They are no longer Alphas and they can no longer merge together.
Although Aiden and Ethan are not Alphas anymore, Scott seeks them out to help him control his werewolf side now that he is an Alpha. They teach him control and not be afraid to turn.
Aiden and Ethan try to join Scott's pack. But Scott says that he doesn't trust them and turns them down. When police say that William Barrow has been sighted near the school, the twins help Scott's pack search for him.
Trying to prove to Lydia that he is not a "bad-guy", Aiden helps Danny set up a Halloween party. While there, he is marked by the Oni.
Aiden and Ethan offer protection to Scott to try and gain his trust so that they may join his pack. They help protect him when the Oni try to mark Scott and Kira at Scott's house.
Aiden helps Lydia search for Stiles. He tells Derek of his suspicions that Stiles helped Barrow.
Ethan and Aiden help Scott find Stiles
Aiden and Ethan help Scott find a scroll that belonged to Silverfinger.
Ethan says that he and Aiden might not stay in school. They become controlled by the Nogitsune and fight with Isaac, Allison and Kira.
Aiden and Ethan try to find Lydia. While looking for her, they are shot with wolfbane bullets. They are saved by Derek despite being shot by several bullets.
Ethan and Aiden want to run, but Derek convinces them to stay and fight. Aiden kills an Oni with one of Allison's silver arrowheads. As he does, he gets stabbed in the stomach. It's a fatal wound. Ethan cradles his brother while he's dying. Aiden asks him if it hurts him, too. He then laments that Lydia will never know that he died as one of the good guys, but Derek vows to tell her because she'll believe him.