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The '''Monumental OverPower''' expansion debuted in May 1997 with 289 cards ''(22 [[Character Cards]], 118 [[Special Cards]], 14 [[Mission Cards]], 36 [[Power Cards]], 16 [[Universe: Teamwork|Teamwork Cards]], 23 [[Event Cards]], 10 [[Universe: Ally|Ally Cards]], 20 [[Tactic: Doubleshot|Doubleshot Cards]], 30 [[Location Cards]])''.==Distribution==Cards were distributed in:* Booster packs of 15 cards* Booster boxes of thirty-six 15 card booster packs* Starter decks of 65 cards* Starter boxes of 12 starter decks==New Special Card codes==With the '''Monumental OverPower''' release, the following Special Card codes were introduced: [[LA]] [[LB]] [[LC]] [[LD]] [[LE]] [[LF]] [[LG]] [[LH]] [[LI]] [[LJ]] [[LK]] [[LM]] [[LN]] [[LO]] [[LP]] [[LQ]] [[ZZ]]==New card types==[[Location Cards]] were introduced.==New gaming mechanics==Homebases and Battlesites were introduced.