Time traveling Captain America will meet Stan in the 1940's (who will of course look exactly the same as he's looked for the last 30 years), telling him something inspiring.
Then Stan will run to a pay phone, saying "Hey Marty, you know how we've been looking for a breakout character? Well, wait till you see this!"
The camera will then reveal what Stan had been drawing: a picture of Hitler being punched by Captain Marvel.
