X-Men - Season 5 - Eps 1: The Phalanx Covenant (1)
Rushing to investigate a disturbance downtown, the X-Men find Sabretooth on the rampage again, but realize too late that it isn't really Sabretooth at all. It is the Phalanx, a voracious alien life-form that can assume the guise of anything or anyone. Before long, the X-Men are all captured, except for Beast, who must find a way to stop the alien horror from devouring the entire Earth.
About X-Men

Title: X-Men
First Air Date: 1992-10-31
Last Air Date: 1997-09-20
Status: Ended
Rating: 8.177/10 (from 1232 votes)
Language: EN
Seasons: 6
Total Episodes: 76
Network: FOX Fox Kids
Genres: Kids, Sci-Fi & Fantasy, Animation, Action & Adventure
Production Companies: Graz Entertainment, Marvel Entertainment Group, Saban Entertainment
Synopsis
The X-Men are an elite team of mutants, genetically gifted human beings with superpowers, sworn to fight for mutant rights against hostile Government agencies, whilst at the same time protecting mankind from mutant supremacist Magneto who seeks to destroy the human race in return for the atrocities committed against mutant kind.
Cast

Cedric Smith
Professor X (voice)

Norm Spencer
Cyclops (voice)

Catherine Disher
Jean Grey (voice)

Alison Sealy-Smith
Storm (voice)

Lenore Zann
Rogue (voice)

Cal Dodd
Wolverine (voice)

Alyson Court
Jubilee (voice)

George Buza
Beast (voice)

Tony Daniels
Gambit (voice)