G.I. Joe meets the Six Million Dollar Man, that's a cross over that happened more than once in my house. This page comes from Simpsons, a long gone Canadian retailer.
Speaking of cross overs, you can see the other side to this beautiful double page spread (which features Big Jim and Mego) at the Megomuseum. It's not quite a cool a crossover as "JLA/JSA" more of a "Diff'rent Strokes" meets "Hello Larry" kind of thing.