The characters are identical twins and had the ability to merge both their bodies into a single large creature. The mechanism for this transformation is never explained and was lost, along with their alpha status, when their merged form was "killed" by Jennifer Blake.
Aiden was later killed by an Oni.
Ethan says they were badly mistreated as members of a pack of brutal werewolves when Deucalion helped them develop their ability to merge together into a larger form.
Once they'd mastered the ability, they killed the rest of their pack, became Alphas, and joined The Alpha Pack.
Aiden died trying to help Scott McCall save Stiles Stilinski in The Divine Move.
- EDITOR'S NOTE: Because it is an FAQ, in The Girl Who Knew Too Much, Ethan says he and his brother were "the omegas" of their pack. This is not to say they were "Omegas" just that they were abused and mistreated. It is an insult, nothing more.
- By the time we catch up with them in Galvanize, the brothers are actually Omegas due to their "death" and the disbanding of the Alpha Pack.
The twins attempt to capture Isaac Lahey and a mysterious girl (Braeden). On foot they are able to chase down and almost catch the motorcycle on which Isaac and the girl try to escape with. After the bike wrecks, they merge into one giant alpha and begin to charge Isaac and the girl. An electrical bolt fired from a "modified tazer" causes them to split back into two separate individuals. Later, they appear at Beacon Hills High School and attack the mysterious girl again, along with the rest of their pack. (Read More...)
Ethan and Aiden are seen in friendly conversations with Lydia and Danny in the school library. (Read More...)
Ethan and Aiden attack Isaac, then frame him for attacking them. After Scott and Isaac mess with their motorcycles, the twins merge into one to take on both boys. They only stop when Deucalion shows up. He punishes them by slicing both of them across the cheek. (Read More...)
Ethan sits with Danny on a road trip with the Cross Country team after the big battle between The Alpha Pack and Scott and Derek's Pack. Aiden is shown in flashback making out with Lydia. He later helps Kali get treatment for Ennis from Dr. Deaton. He comforts her after Ennis dies. (Read More...)
Ethan rooms with Danny during the team trip. The pair make out until Ethan begins to hallucinate and leaves to try to kill himself. Stiles stops him. In the morning, he tells Scott that Derek is still alive. He blames him for the death of Ennis and says either he must join their pack, or be hunted down by Kali. (Read More...)
Ethan brings Danny to the hospital for shortness of breath and chest pains. Ethan admits that he and his brother went after Lydia and Danny because they knew one of the two would be important to Scott. Aiden and Lydia make out. Both Twins hold Jennifer Blake captive during the attack on Derek's loft. (Read More...)
Aiden confronts Ethan and tells him to stop talking to Danny. Later, he is seen making out with Lydia until she confronts him about killing Boyd. Ethan reveals the Twins' backstory to Scott and Stiles: they were the Omegas of a pack, always the last to eat and the first to be abused, until Deucalion found them. He showed them how to control their power of merging together, allowing them to eliminate their whole pack and becoming Alphas by killing their own. Aiden is seen fighting Cora until Ethan and Scott stop the fight. Aiden and Ethan are both seen at the concert. (Read More...)
Ethan goes to the animal clinic wanting Lydia to help him stop Aiden and Kali from killing Derek. The merged twins attack Jennifer and she breaks their necks. They survive thanks to Deaton. (Read More...)
The Twins are not Alphas anymore, but Scott seeks them out to learn how to control his werewolf side and not be afraid to unleash it when necessary. (Read More...)
The twins try to gain Scott's favor by offering protection. It's put to the test when the Oni attack the McCall house. (Read More...)
Aiden helps Lydia search for Stiles. He tells Derek of Stiles suspicions that he helped Barrow. (Read More...)
Ethan and Aiden help Scott find Stiles. They attack him and are forced off by Scott. Ethan tries to save Danny from a trap by tackling him and kissing him in the woods. (Read More...)
The twins help Scott retrieve a scroll that belonged to Silverfinger and brutally attack an opposing werewolf in the process. (Read More...)
The twins want to run but Derek convinces them to stay and help Scott fight the Nogitsune. Aiden is killed. (Read More...)
Aiden appears to Lydia at Eichen House and tells her that "her treatment isn't done yet." Later, Aiden becomes Dr. Valack acting as he is talking to Lydia. (Read More...)
- “Ethan, I always forget, how many bones in the human body?" "I don't know. Let's count.” — Ethan and Aiden after grabbing Isaac in Unleashed
- “Stop talking to Danny... or I'm gonna rip the flesh off his face and eat it.” — Aiden to Ethan in The Girl Who Knew Too Much
- “All we want is her!” — Ethan and Aiden speak in their merged form to Scott about Jennifer in The Overlooked
- “Where is she?! We're trying not to hurt you!” — Ethan and Aiden to Scott in The Overlooked
- “I'm not taking math." "I'll take it for you.” — Ethan and Aiden in More Bad Than Good