Thomas starred as Finn Avery in the TV mini-series Storytellers from 2013 to 2014. He has starred in the movies The Cell, If Tomorrow Comes, A.I. Artificial Intelligence, The Lizzie McGuire Movie, Dinocroc, Soccer Dog: European Cup, Locked Away, and The Assignment. Thomas has also appeared in episodes of the TV series 3rd Rock from the Sun, The Man Show, Touched by an Angel, Without a Trace, The Grim Adventures of Billy & Mandy, ER, Cold Case, Lie to Me, Eleventh Hour, House M.D., Trust Me, CSI: Miami, Rules of Engagement, Ghost Whisperer, The Whole Truth, Criminal Minds, The Secret Life of the American Teenager, NCIS, and CSI: NY. Thomas won a Young Artist Award in 2002 for Artificial Intelligence: AI.