Challengers of the Unknown and The Fantastic Four

OK, this on wasn't going to be posted for a while, but folks were asking about pairing these two teams so I decided to move it up in the rotation.  There are certainly similarities between these jumpsuit-wearing foursomes, and it would be cool to see them in one big story together.  I remember getting a kick out of the amalgamated Challengers of the Fantastic that spun out of the Marvel/DC crossover (indeed those Amalgam issues are much more satisfying than the crossover itself).  Both teams are looking good these days - The FF just had their 600th issue with the return of Johnny Storm and DC is currently publishing new Challengers stories with the talented pencils of Jerry Ordway.