Marvel Super-Heroes Vol 1 #17 Thor The Sentinels had showed up

The Sentinels had showed up again ( issue #98) and after a few issues and a long battle it ended up with Jean Grey sacrifice in order to save all the X-Men from solar radiation ( issue #100)

the Avengers

Falcon tells Barnes to leave before S

Every living being on Earth is now held in suspended animation - and they'll remain that way unless Marvel's super heroes agree to take part in the "contest"

the terrorist known as Magneto lauches his greatest assault on the human race

Marvel Super-Heroes Vol 1 #17 Thor The Sentinels had showed upDane Whitman is harboring doubts about his super hero identity, Black Knight. After encountering the spirit of Sir Percy of Scandia, Whitman realizes that he may be a worthy possessor of the title after all.