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The Army of the Underworld are the secondary antagonists of the Regular Show season 4 premiere half hour special "Exit 9b".

They are comprised of various past foes of Mordecai and Rigby summoned by Garrett Bobby Ferguson Jr. through the portal in Exit 9b.


After completing Exit 9b, Garrett Bobby Ferguson Jr. opened a portal to the underworld and summoned all the past foes of Mordecai Rigby to take revenge, including his father Garrett Bobby Ferguson. However, Mordecai, Rigby and the rest of the gang soon receive assistance from the Ducks, the Guardians of Eternal Youth, Death, and Techmo, leading to a massive battle between the two sides. Eventually though, Mordecai and Rigby are able to get Benson's signature on the document stating that the park is a historical landmark, thus calling for the destruction of Exit 9b.

However, G.B.F. Jr. points out that there is one missing employee - Thomas, who started work the day he took over. G.B.F. Jr. threatens to shoot Thomas unless Mordecai hands over the document - Mordecai gives G.B.F. a folder, and Thomas is kicked over the edge of the freeway ramp. However, Benson is able to swoop down and save Thomas, while Mordecai and Rigby reveal that they'd make a last-minute switch to the document folder, meaning that Thomas is able to sign the document and save the park at the last minute. This causes the portal to suck all the villains back in.



  • He is defeated by Mordecai and his friends using the "Thomas" sign to suck the portal to his death.


          Regular show logo.png Villains

Anti-Pops | Benson Dunwoody | Rigby | Muscle Man | Thomas/Nikolai | Mr. Maellard | Moon Monster | Destroyer of Worlds | Coffee Bean and Translator | Gary | Guardians of Eternal Youth | Talking Hot Dogs | Unicorns | Master Prank Caller | British Taxi | Snowballs the Ice Monster | Peeps | Iacedrom and Ygbir | Garrett Bobby Ferguson | The Hammer | Party Pete | Summertime Song | Susan | Game Store Manager | Starla Gutsmandottir | Doug Shablowski | Ybgir | Zombies | Howard Fightington | Death | Night Owl | Duck Collector | Warden of the Internet | Were-Skunk | Carrey O'Key | Chong | Blond Men | Percy | Skull Punch | Halloween Wizard | Stag-Man | Broseph Chillaxton | No Rules Man | Blitz Comet | The Urge | Klorgbane the Destroyer | Death's Wife | Buttonwillow McButtonwillow | Gene | Death Bear | Capicola Gang | Garrett Bobby Ferguson Jr. | Army of the Underworld | Promise Pie | Hector | Quillgin | Geese | Mitsuru Shinehara | Cool Cubed and Translator | Frank Jones | Ancient Order of the VHS | Johnny Allenwrench | Scarecrow | Jebediah Townhouse | Silver Dude | Dale Deseeko | Richard Buckner | Cop | Matchmaker McIntyre | Internet | David | Happy Birthday | Racki the Wishmaker | Natalia | Dr. Dome | Rich Steve | Steve's Army | Ziggy the Garbage King | Anti-Pops' Minions

Mr. Ross | Future Mordecai