The Amazing Spider-Man #329 (1990)
“Acts of Vengeance: Power Prey”
Writer: David Michelinie
Artist: Erik Larsen
Loki, bitter about his acts of vengeance plan failing and disbanding, turns three Sentinels into one mega Sentinel and sends it to destroy a nuclear plant (in effect destroying the whole city). Graviton wants another piece of Spider-Man, but Spidey makes short work of him. Spidey is blasted by an energy beam by Sebastian Shaw and becomes Captain Universe. Something blocked the full transformation before. The Enigma Force chose him to stop the Tri-Sentinel. He renders the Sentinel to dust with the power and the Enigma Force leaves him.
Flash shows up to Peter’s apartment with his new girlfriend…Felicia Hardy (aka The Black Cat).