Ashmore had starring roles on Animorphs as Jake Berenson and In a Heartbeat as Tyler Connell. Īshmore starred as Cadet Major Brad Rigby in Cadet Kelly, a Disney Channel original film which aired in 2002 and he guest-starred as Eric Summers in two episodes of Smallville, a series on which his brother was later cast in the role of Jimmy Olsen. Ashmore also reprised his role as Iceman in the animated series The Super Hero Squad Show, as well as voicing the role for X-Men: The Official Game.
One of Ashmore's notable roles was as Iceman in X-Men and its sequels X2 and X-Men: The Last Stand.