If we're being technical it would have been AD&D after red box D&D. But more in the spirit of the question the answer is Teenage Mutant Ninja Turtles and Other Strangeness. I loved a good tie in when I was a kid.
Dragonbane is my default choice for kitchen sink fantasy these days, but I could be tempted to run Heart: the City Beneath. Heart's slow attrition of the characters makes sense for a dungeon crawl. It would be neat to see in practice.