It was a common practice back in the day for the networks to preview their Saturday morning fall lineups in primetime. ABC traditionally did this on the eve of the new season, and there were a few clunkers along the way.
The 1973 model may just fit under "clunker", for that matter. I barely remember seeing this the first time around, and, sad to say, the following clip is all I can find. The comedy team of Jack Burns & Avery Schreiber served as hosts for this edition. Schreiber would move to CBS the next year to co-star on The Harlem Globetrotters Popcorn Machine, but as memory serves, he & Burns (ex-The Andy Griffith Show) had their own series on ABC around this time, hence landing this gig. Anyway, Avery entertains his nephew, and gets help not only from Burns, but from a few guests, including Bugs Bunny (voiced, of course, by Mel Blanc, but otherwise an anonymous guy in a suit, probably hired away from a theme park). And, yeah, that is Chuck Woolery, a couple of years away from Wheel of Fortune, as Superman. Chuck would also be involved in a revival of Your Hit Parade a year or two later. Not sure who was cast as Batman.
Josh Schrieber uploaded this clip:
I had seen better before and after this. Rating: C-.