The X-Men OverPower expansion debuted in January 1999 with 200 cards (38 Character Cards, 126 Special Cards, 4 Ally Cards, 5 Location Cards, 4 Artifact Cards, 23 Aspect Cards).
Cards were distributed in:
- Booster packs of 15 cards
- Booster boxes of 36 booster packs
New Special Card codes
With the X-Men OverPower release, the following Special Card codes were introduced: FF FG FH FI FJ FK FL FM FN FO NG NH NI NJ NK NL NM NN NO NP NQ NR NS NT NU NV NW NY NZ OA OD
New card types
Aspect Cards were introduced.