Army of the Underworld

The Army of the Underworld are the main villains 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.
Category:Regular Show Villains
Category:Cartoon Villains
Category:Cartoon Network Villains
Category:Factions
Category:Deceased Villains
Category:Evil Minions
Category:Evil Fighters
Category:Vengeful Villains