Giant-Size Avengers #1 Aug 1974
"Nuklo: The Invader That Time Forgot!" Guest-starring the Golden Age Whizzer.
The Whizzer
aka Robert Frank invades Avengers Mansion looking for the Chrono-Module.
After a brief battle with the Avengers, the Whizzer begins to explain his motives; but suddenly the module breaks open...and Nuklo emerges!
The Avengers battle Nuklo throughout New York City; and the Scarlet Witch makes the team's final stand against the runaway nuclear child!
During the story Robert Frank reveals that Nuklo is his son,
and Quicksilver and the Scarlet Witch are apparently his children as well!
Story by Roy Thomas.
Art by Rich Buckler and Dan Adkins.