Amazing Spider-Man (1963 1st Series) #351

"The Three Faces of Evil!" Part 1 of 2. Guest-starring Nova. Script by David Michelinie. Pencils by Mark Bagley (begins as regular artist). Inks by Randy Emberlin; Cover by Mark Bagley and Randy Emberlin.

Spidey and Nova witness the robbery of a container of rare Antarctic vibranium. They trace the thieves back to a complex run by the Life Foundation and discover that the vibranium is being used as a failsafe for the Tri-Sentinel which the Foundation plans on using for their own protection. Despite Spidey's protests, the Tri-Sentinel is activated and immediately reverts to its original programming: the destruction of nuclear power plants! With the deadly robot on a rampage, Spidey and Nova have a fight on their hands!