Team-Up Bonuses are awarded when certain heroes are paired together in a battle. Some hero pairs get multiple Team-Up Bonuses. As part of the PvE Score Modifier, Team-Up Bonuses improve the player's total score and increases the speed of obtaining Mastery Stars.
The pairing of heroes for the Team-Up Bonuses are based on certain events that happened in the mainstream comic books of the Marvel Universe. This can be from existing or former organizations, to love pairings and couples and to power use and abilities. The specific reason for a Team-Up Bonus is described on the Team-Up Bonuses for the Facebook version.
The players are awarded 50 points per Team-Up bonus at the end of the battle. Not all pairings of heroes will receive bonuses, not all the bonuses listed in the Facebook version are awarded on the mobile version of MAA, and the specific Team-Up bonuses is not displayed on the Mobile version. The Team-Ups that give more than 100 points are listed here.