Descent
- Episode aired Sep 6, 1997
- TV-Y7-FV
- 21m
The origin of Mr. Sinister is revealed, as Professor Xavier attempts to stop Essex before he goes too far.The origin of Mr. Sinister is revealed, as Professor Xavier attempts to stop Essex before he goes too far.The origin of Mr. Sinister is revealed, as Professor Xavier attempts to stop Essex before he goes too far.