After minions turned into zombies, Gru faces mutant threat to save family. Recap of "Despicable Me 2" (2013): Work from Arctic lab sucked up by strange magnet ship. AVL agent Lucy recruits retired super villain Gru for help. Gru dresses as princess, entertains at daughter's birthday party. While out, Gru meets Lucy, freeze gun vs. flaming pistol encounter. Minions help Gru escape, ending up in submarine car. Lucy drives car into sea, transforms into submarine. Gru and minions immobilized by shock lipstick, saved by Lucy. Action-packed adventure ensues in battle against mutant threat.