Michael Deluise joins the cast as Joey Penhall and is included in the opening credits.
Joey Penhall left home at the age of 15 because he couldn't stand watching his father drink himself to death. This left Doug, who stayed with his father until the bitter end, feeling betrayed.
TRIVIA: Real-life brothers, Michael and Peter DeLuise, not only starred together on 21 Jump Street but they went on to work together on the NBC series seaquest, DSV that ran from 1993 to 1996.
Joey: When I was a kid, I thought, the only thing family was for was to share pain. That was the only thing I knew when I was growing up. 5 years on the street changed my mind about that. Five minutes with my brother changed it back.
Girl: You have a new family now, Joey!
When Michael Deluise came to the show the producers hadn't thought of a name for his character so Michael got to chose his own character's name.
This is the first appearance of Michael DeLuise as Officer Joey Penhall.