The Uncanny Challenge Of The Monstrous Crusher! 1st appearance "Crusher" (Caldwell Rozza)
While Tony Stark is testing out a Centrifuge Machine which would increase the gravity of whoever was rigged to the device, a Communist dictator, "El Presidente" has one of his best scientists to create a chemical that would turn whoever drinks it into an indestructible powerhouse.
However, when the scientist presents the formula to the dictator, he senses treachery and so forces his own scientist to drink it at gun point. When it works, they try all manner of artillery to see if the scientist (now dubbed "The Crusher") has any weakness. Thoroughly convinced, they send him out to destroy Iron Man.
Arriving in the United States, the Crusher repels all attacks on him as he makes his way to the Stark Industries building. There he gets into a fight with Iron Man, who finds that the Crusher is impervious to whatever weapon he uses against him. Thinking quickly, Iron Man then attaches the centrifuge device to the Crusher, causing his gravity to exponentially increase. This increase in gravity makes the Crusher break through the floor and plummet down to points unknown.
When repairing the floor as Tony Stark, Happy Hogan and Pepper Potts arrive to tell him that they eloped and are now married, Stark congratulates them.