Then: He was the oldest member of the Camden family who bounced from job to job and had a few serious girlfriends. After experimenting with pot, he eventually got his act together and became a doctor. In 2002, Watson left the show after being diagnosed with Hodgkin's disease. He took a hiatus from acting until he went into remission in 2006, but returned to '7th Heaven' for a few guest appearances before the show ended.
Now: Watson played the lead in the short-lived ABC comedy 'What About Brian?' before starring in ABC's 'Samantha Who?' as Christina Applegate's former fiance. Earlier this year he starred in the ABC Family original movie 'My Future Boyfriend' opposite Sara Rue.