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The Space-Time Vortex is the common science fiction name for an area that characters enter when they travel through time and space. It appears in the episodes "SB-129," "Back to the Past," the short "Lessons Learned," and The SpongeBob Movie: Sponge Out of Water.
Inside of this area is a black and green spiral, along with random objects that were created during the moment of time the machine was currently in.
"Back to the Past"/"Lessons Learned"
The SpongeBob Movie: Sponge Out of Water
Role in SpongeBob SquarePants
In all four appearances, it appears when characters travel through time.