There were boys around, too, but Jonathan Ward and Michael Pearlman from the 1984-85 version can't be found. That leaves Alexander Polinsky, who appeared as Adam Powell in 104 episodes in the second version (1986-90).
The show was focused on Charles, his buddy Buddy (Willie Aames), and the two teenage girls, so Adam didn't get a lot of centrics: he is harassed by a bully, gets a crush on a girl, takes a babysitting job. I recall one episode where Adam has to explain that he doesn't like playing football. He starts off with a list of the sports he does like, lest Charles get the idea that he is a sissy/ gay.
Left: Alex with fellow 1990s teen stars Stephen Dorff and Brian Austin Green
After Charles, the 14-year old had guest spots on Billy (about a Scottish comedian), The New Lassie (about a dog), and Joe's Life (about a stay-at home Dad), and starred in Pumpkin II: Blood Wings (1994): teenagers accidentally unleash an ancient demon, who kills them all except the Final Girl.
In Perfect Fit (2000), Dick (Alex) "turns to murder" to satisfy his girlfriend, a blue jean fetishist.
Former Colt model and soap stud Nick Benedict appears as Thomas, one of the jeans donors.
Control Freak in Teen Titans
Garrett in Alpha Teens on Machines
Chameleon Boy in Legion of Superheroes.
Jimmy Olsen in Batman: The Brave and the Bold
Unicorns 1 and 2 in Breadwinners
Several characters in Monster High: the Series
He returned to live action for the the anthology movie Locker 13 (2014). In Segment 3, Alex plays a mental patient considers jumping off a building, until the fast-talking Jason Marsden tells him about a Suicide Club, where members bet on when and how people will off themselves.
Roger Ebert.com tells us: "Rarely do I find a movie that is so appalling if not outright insulting to all of humanity (and particularly, in this case, womankind) that it gives me a stomach ache, but Locker 13 really put me off my Cobb Salad."
Still, Alex highlights his segment in his acting demo reel.
Alex has one writing/producer credit: Going Furthur (2016), 1966-67, Ken Kesey and his Merry Pranksters took a psychedelic bus called Furthur up and down the West Coast, offering Acid Tests to introduce the youth counterculture to LSD.
This one sounds interesting.
More after the break