The different stars represented the facets of actors' work: Stage, movies and television. Television actors who could sing (Nancy Dussault, Pam Dawber, and John Schneider) but no one knew they could were put into a mock take on "What's My Line?" Broadway stars belted out songs from the shows which made them big names. And movie actors...well they mostly gave speeches or did bits.
The show is full of skits and walk ons hurried so as to fit 100 stars into such a short time span. At one point they simply had actors of Christopher Reeve's ilk wearing a top hat and tails stroll across stage to hear their names announced!
There was a sequel to this show but nothing could top the pure kitsch quality of the original. They don't make'm like this anymore...and I will leave it up to you as to whether or not that is a good thing.