What It Is: Oh, heavens! A cold front is moving in, mysterious earthquakes shake the Park, and worst of all, someone has stolen Pops's socks! Springing into action, Mordecai and Rigby look to the best role models they have-movies, duh-to crack the case. With the combined powers of noir and '90s action flicks behind them, these two sleuths should be unstoppable...but this time, they may be up against a bigger foe than they can match. Follow the slime!