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