Tommy Rettig
Of course, Tommy is renowned for being Lassie’s best friend. He also co-starred with another former child actor, Tony Dow, in the mid-1960s television teen soap opera Never Too Young and recorded the song by that title with the group, The TR-4. He pursued some other acting projects after the show wrapped, but he was unsatisfied. He became a software engineer and worked until his death in 1996, working with computers.
Mackenzie Rosman
Mackenzie Rosman is known for portraying the character named Ruthie Camden in 7th Heaven. She was on the show for most of her childhood and teenage years. She is a devout philanthropist outside of acting. As chairwoman of Curefinders, which helps children suffering from cystic fibrosis, she is most involved.