Plot: Mordecai and Rigby try to fix the toilet then the water floods the whole house. Then epic Mickey disc comes into the toilet then . Mordecai and rigby grabbed it then it transports them to wasteland. And they figured out they replaced flapjack and k.nuckles. And All the other regular show gang has been transported to wasteland too. And mordecai and rigby have to defeat all the villains from the show. And they go to the 1980s (again) And Mordecai and Rigby have to defeat Margaret's Ex Boyfriends: Slasher,Angel and The Giant boyfriend.
References: Epic Mickey Scott Pilgrim VS The World