Thomas began his television career in 1990, playing the role of Kevin Brady, the son of Greg Brady, on The Bradys, a spin-off of the 1970s TV show The Brady Bunch. In 1991, Thomas appeared in three episodes of Fox's sketch comedy series In Living Color. That same year, he was cast as middle son Randy Taylor on ABC's sitcom Home Improvement. Despite looking much younger, in reality, Thomas was a month older than Zachary Ty Bryan who played his elder brother Brad. Thomas remained with Home Improvement well into his teenage years but left the show in 1998 to focus on academics.
