Phineas and Ferb and Regular Show Crossovers
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An Uneasy Alliance by TARDIS1039 reviews
Rigby builds a machine that travels to different universes and Phineas and Ferb do the same, but Phineas, Ferb and Perry travel to Mordecai and Rigby's world, Mordecai makes friends with them easily, so Rigby becomes jealous of Mordecai and decides to team-up with Dr Doofenshmirtz to destroy Twin Peaks! So Mordecai, Phineas, Ferb and Agent P have to stop him!
Rated: K+ - English - Adventure/Friendship - Chapters: 1 - Words: 158 - Reviews: 4 - Favs: 2 - Follows: 3 - Published: 8/27/2012 - Phineas, Ferb, Mordecai, Rigby