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X-Men: Season5 | Episode12
Descent
The origin of Mr. Sinister is revealed.
S5 - E1The Phalanx Covenant (1) Sep. 07, 1996
S5 - E2The Phalanx Covenant (2) Sep. 07, 1996
S5 - E3A Deal with the Devil Sep. 14, 1996
S5 - E4No Mutant Is an Island Sep. 21, 1996
S5 - E5Longshot Oct. 05, 1996
S5 - E6Bloodlines Oct. 26, 1996
S5 - E7Storm Front (1) Nov. 02, 1996
S5 - E8Storm Front (2) Nov. 09, 1996
S5 - E9Jubilee's Fairytale Theatre Nov. 16, 1996
S5 - E10The Fifth Horseman Feb. 08, 1997
S5 - E11Old Soldiers Feb. 22, 1997
S5 - E12Descent Sep. 06, 1997
S5 - E13Hidden Agendas Sep. 13, 1997
S5 - E14Graduation Day Sep. 20, 1997