It’s said that if you have to explain a joke it’s not a good joke. That being said, in case the drawings aren’t effective enough I should explain who those characters are in that dimension portal. In the mid to late 1970’s CBS had several TV shows and TV movies featuring Marvel Comics characters.

On the far left, Lou Ferrigno as the Hulk on “The Incredible Hulk” TV series (1978-1982)

On his right, Eric Allan Kramer as Thor on the TV movie “The Incredible Hulk Returns” (1988)

On his right, Rex Smith as Daredevil on the TV movie “The Trial of the Incredible Hulk” (1989)

In the front, on the left, Nicholas Hammond as Spider-Man on “The Amazing Spider-Man” TV series (1977-1979)

On his right , Peter Hooten as Dr. Strange on the TV movie “Dr. Strange” (1978)