The scene in particular highlights one of the main problems of the Fox saga on mutants.
If you have already seen The Marvelsyou will know very well that the mid-credits scene introduces an alternative reality in which there are X-Menbut the sequence highlights one of the problems the Fox saga had at the time.
The mid-credits scene of The Marvels sees the appearance of Kelsey Grammer’s version of Beast, who greets Monica Rambeau upon her arrival in an alternate reality, firmly connecting 20th Century Fox’s X-Men franchise to the MCU for the first time.
Continuity has been an issue almost since the beginning, with logical gaps and outright contradictions dogging the franchise until its conclusion with 2019’s X-Men: Dark Phoenix. Linking them to the notion of parallel realities and the multiversal incursion at the center of the plot of The Marvelsthe MCU may be ready to resolve these continuity issues once and for all.
Which version of Beast is canon?
Grammer’s version of Hank McCoy made a brief cameo in X-Men: Days of Future Past, but had already appeared in X-Men: The Last Stand. Nicholas Hoult then took on the role starting in 2011’s X-Men: First Class, playing him three more times over the next decade, as well as a cameo in Deadpool 2.
This makes Hoult the go-to version of the character, as he has been playing him for longer and even more recently than Grammer. However, it is Grammer’s version of Beast that appears in The Marvels to greet Captain Rambeau when he arrives in a parallel world where he finds his mother still alive.
The MCU’s Multiverse may have already solved the problem for the X-Men, simply by establishing that similar realities aren’t necessarily the same. He’s already done it once with Patrick Stewart’s cameo as a variant of Professor 3.
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Grammer’s Beast has a deeper meaning, which suggests that the MCU intends to directly address the mistakes of its predecessors, rather than simply cherry-picking the elements it wants. Probably, the continuity problem will be addressed and resolved in Avengers: Secret Wars.