Deadpool 3 is going meta with its many cameos, as the Merc with a Mouth will see mashups throughout the multiverse. Not only is he teaming up with Hugh Jackman's costumed Wolverine, but several other Marvel heroes from outside the Marvel Cinematic Universe will be present. As exciting as this sounds, it could be a problem for the movie, especially at the box office.
Source：https://www.cbr.com/deadpool-3-repeating-the-flash-nostalgia-gamble/
