This is a series. Set in the Marvel Cinematic Universe universe.
A human abducted as a child, a green assassin, a literal-minded warrior, a talking raccoon and a tree with one line are thrown into the same prison and break out of it together, then decide to stop a fanatic from destroying a planet with a stolen stone. Almost nobody outside comics had heard of any of them, which is why its success changed what studios thought they could sell.