It seems to be a well-loved trend of late that when studios embark on presenting a superhero character on the silver screen, eventually, said superhero is going to have to team up with other superhero characters from their same universe for the big pay-off. Marvel Studios carried out such a spectacle with its 2012 film Avengers Assemble and now DC Entertainment is gearing up to do the same thing with The Justice League.

With that theory understood, many cinemagoers have been wondering if or when 20th Century Fox's Deadpool is going to be seen teaming up with any of the X-Men? Well, according to X-Men: Apocalypse director Bryan Singer it's something that could well happen in the future, but only if it is done "carefully".

"If you take a character as irreverent and meta as Deadpool and connect him to something as grounded and serious as X-Men, you have to do it carefully and gently," Singer explained to Variety. "When you drop them all in together it can be a disaster. That has to be done delicately, but there's plenty of room to do it. Now that we've altered the timeline [with 2014's X-Men: Days of Future Past], there are endless possibilities."

While each of the franchise's separate worlds have already been established, one way that Deadpool could be incorporated into the X-Men universe smoothly could be through an X-Force movie, which would likely see Deadpool in cahoots with Wolverine or Nightcrawler, Archangel or Storm, just like in the comics.

Earlier this year, Deadpool star Ryan Reynolds discussed making an X-Force movie 20th Century Fox

In February of this year, Deadpool star Ryan Reynolds told Filmstarts that getting an X-Force movie made was a priority of his, adding: "In the future, if we're doing a bunch more Deadpool movies, we're gonna really explore the X-Men a lot. And maybe X-Force. I really want to get that in."

Luckily, Singer also thinks X-Force holds storylines that could be explored on the big screen, telling Variety: "I think the underbelly [could be explored]. There's always something interesting about a school that's got a military aspect beneath its classrooms. Is there another layer to all of that?

"Is there another layer to the Hellfire Club? The idea of, 'Who's running the world?' — that's something that was touched upon in First Class but has yet to be fully explored. It just has to be explored in a very gentle, methodical way. And I've seen it go haywire. I'm not going to be specific where I believe it has. The audience will tell you. But when it's done right, it all can connect."

While cinemagoers might be waiting a long time before they can see the X-Men universe exploring other realms of their Marvel Comics source material or joining up with the Merc with a Mouth, Deadpool, luckily they won't have to wait long before X-Men: Apocalypse is released. The eagerly-anticipated instalment is set for UK release on 18 May and US release on 27 May.

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