Marvel Comics has been involved in various exchange deals with other comics publishers over the years. Some notable exchanges include trading characters with DC Comics in the past. Additionally, Marvel has collaborated with companies like Image Comics and Valiant Comics for crossover events.

It is a crossover from Marvel Comics. Apocalypse is in the X-Men series originally.

Yes, Captain America is still being published by Marvel Comics. The character continues to be a central figure in the Marvel Universe and is featured in various comic book series and crossover events.

Yes, DC characters have appeared in Marvel Comics through various crossover events. Prominent examples include the crossover series "JLA/Avengers" and individual appearances like when Batman and Spider-Man teamed up in "Spider-Man and Batman: Disordered Minds."

DC vs. Marvel Comics is the limited series crossover published by both DC and Marvel Comics that features a battle between Hulk vs Superman. It was published in 1996.