Tony Stark is just noodling around, minding his own business in 1968, when he's kidnapped by dickweeds from the future!!
[P.S. Sorry, Manchester!]
Tony finds a more sympathetic rebel, who helps Tony find a well-preserved suit of armor in a museum. And after some pointless punching and kicking, well, Tony just Kirks the hell out of the damn computer!
And then Tony travels back to 1968, and doesn't invent Skynet.
What the hell have you done to clean up your mess lately, Pym?!?!
From Iron Man #5 (1968)