The Short Circus
The lineup changed multiple times over the course of the show:
First lineup: Irene Cara, Melanie Henderson, Douglas Grant, Stephen Gustafson and June Angela
Second lineup: Julie (June Angela), Zachary (Douglas Grant), Buddy (Stephen Gustafson), Kathy (Melanie Henderson) and Allison (Denise Nickerson)
Third lineup: June Angela, Gregg Burge, Stephen Gustafson, Melanie Henderson, Bayn Johnson
Fourth Lineup: Bayn Johnson, Gregg Burge, ?
...aaaand Todd Graff, Rodney Lewis, Rejane Magloire, and Janina Matthews in there somewhere.
Irene Cara later came to fame with, uh, Fame.