- "And to do that, we must go to the lower levels. The underworld."
- ―Plo Koon
Underworld portals were massive ventilation shafts and shipping portals that allowed starships and airspeeders to enter and exit Coruscant's extensive undercity, while also collecting numerous drainage pipelines from nearby buildings on the ecumenopolis' surface, one of which originated at the Republic military base.
- Star Wars: The Clone Wars – "Lethal Trackdown" (First appearance)
- Star Wars: The Clone Wars – "The Jedi Who Knew Too Much"
- Star Wars: The Clone Wars – "To Catch a Jedi"
- Star Wars: The Clone Wars – "Orders"
- The Clone Wars: Season Seven
- "The Right Wrong Turn"—Star Wars Adventures 25
- (First identified as underworld portal)