Avengers Vol.1 #51
With the Avengers' roster down to three, Hank Pym tries desperately to restore his size-changing powers! But his first attempt fails! And before he can try again; the Collector abducts Hank and his two remaining teammates! The trio of avengers is shocked to be onboard the Collector's ship! And further shocked that the thunder god is working with the ancient elder of the universe!
Printed: Apr 1968
Writers: Roy Thomas
Art: John Buscema and George Tuska
Cover: John Buscema and Joe Sinnott