Warning: This article contains spoilers for Excalibur #4!

The X-Men have unwittingly unleashed a Dungeons & Dragons invasion of the U.K. in this week's Excalibur #4. Marvel's relaunch of the X-Men franchise has been a tremendous success, and a particular highlight is the new Excalibur series. Written by Tini Howard and with art by Marcus To, it features an eclectic group brought together because the mutant island of Krakoa is threatened by an invasion from the mystical Otherworld.

At the heart of Excalibur stands Betsy Braddock (formerly Psylocke), who has become the new Captain Britain after her brother Brian was subdued by Morgana Le Fey. That places Betsy in a difficult position, with her loyalties divided between her British heritage and the new mutant nation of Krakoa. It doesn't help that the rise of Krakoa has caused dramatic changes in Otherworld, according to the mystical principle of "as above, so below."

Related: X-Men Finds Romance With The LAST Mutant Fans Expect

Excalibur #4 sees the crisis escalate, as the X-Men unwittingly trigger what can only be called a Dungeons & Dragons invasion of the U.K. In earlier issues, Captain Britain made the mistake of riding a dragon in Otherworld, and using dragonfire. Unfortunately, with the fabric of Otherworld now weakening, dragonfire creates tears between the dimensions. Mystical creatures are drawn to these tears and are emerging in the real world.

Excalibur 4 Otherworld Invasion

The issue highlights traditional mythical creatures such as a griffin and a hydra attacking London landmarks, and a whole legion of monsters are on the way as well. Making matters worse, Apocalypse believes this is just the opening salvo in a battle between Captain Britain and the Otherworldly forces of Morgana Le Fey and the treacherous Clan Akkaba, who have betrayed Apocalypse in order to work for her now. It looks as though Captain Britain was manipulated during her visit to Otherworld.

The new Captain Britain has had something of an inauspicious start, and Excalibur #4 reveals that Betsy Braddock is yet to gain the trust of the country she now champions. Howard's script perfectly captures the current state of British cultural politics, with large tracts of the country struggling to understand the fact that people can have multiple identities. Worse still, it's important to remember that Captain Britain's powers are related to her sense of confidence, and right now Betsy is full of self-doubt. She was thrust into a role she never intended to occupy, and is still working out what her new abilities are - let alone to master them. Still, any sword is forged in the fire, and Excalibur will be no different.

Excalibur #1 is on sale now from Marvel Comics

More: Yes, The X-Men Are Creating Another Mutant Nation Already