Thomas Alexander Dekker is an American film, television actor, musician and voice actor. He is also a singer and has written and produced two albums. He is best known for his roles as John Connor in Terminator: The Sarah Connor Chronicles, Adam Conant on The Secret Circle, and Zach on Heroes. Dekker did the voice of Littlefoot in The Land Before Time V-IX (singing voice in The Land Before Time V) and as Fievel Mousekewitz in An American Tail: The Treasure of Manhattan Island and An American Tail: The Mystery of the Night Monster. He is known for playing Jesse Braun in the 2010 remake of A Nightmare on Elm Street, and Smith in Gregg Araki's film Kaboom. Dekker starred as Gregory Valentine in the TV show Backstrom.