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S05E01 The Phalanx Covenant (1)

While responding to a commotion in the city, the X-Men encounter what appears to be Sabretooth wreaking havoc. However, they soon discover that it is actually the Phalanx, a relentless extraterrestrial entity capable of mimicking any form. As the X-Men are swiftly ensnared, Beast manages to evade capture. Now, he must devise a plan to thwart the alien threat before it consumes the planet.