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Rick falls

The Dimensional Portal was created by the advanced Altrusian race as means to go to different places in space and time. Enik has the ability to control these with The Mageti, a white crystal. A Matrix Table can be used to open and close portals by touching crystals in the proper sequence.

In "Elsewhen", while experimenting with a Matrix Table, Rick Marshall opened a doorway which led to Rani, an older Holly Marshall.

In "After-Shock", Rick Marshall fell into the doorway which lead back to Earth.