Leocomix wrote:
There were other Annuals which included either Spider-Man or the Thing as guest stars in case the main series was cancelled. I remember a Nova/Spider-Man team-up.

The Nova/Spider-Man team-up wasn't in an Annual, though.  It was in a planned crossover between AMAZING SPIDER-MAN and NOVA.

There was a Nova/Thing team-up that appeared in MARVEL TWO-IN-ONE ANNUAL #3.  I suppose it's possible that story may have been intended for a NOVA ANNUAL, especially since the creative team was Marv Wolfman and Sal Buscema.