The crossover pack contains cards for the following:

White Death

•  6 Heroes: Ogon, Yasuke, Sarnaï, Dragomir, Lorna, Jenia
•  2 Roaming Monsters: Khan Abomination, Defiler Necromancer

Eternal Empire 

•  6 Heroes: Jianrui, Yinying, Shao, Zhi Shen, Zhi Yang, Fengbao
•  1 Mob: Warden Brutes

Divine Beasts

•  4 Roaming Monsters: White Tiger, Black Tortoise, Vermilion Bird, Azure Dragon

 Teenage Mutant Ninja Turtles - Timecrash

•  7 Heroes: Raphael, Donatello, Leonardo, Michelangelo, April O’Neil, Splinter, Casey Jones
•  1 Mob: Foot Ninjas
•  1 Roaming Monster: Shredder
• 14 Item Cards

Please note that the Massive Darkness Crossover set only contains the cards for these characters, you'll need to acquire the corresponding Optional Buys to have the miniatures to use them. You will also need a copy of the Massive Darkness core box to use this item.