After it is picked up, a time portal will appear which must be entered in order to complete the level.

With seconds to spare they escape through the time portal back to 1999.

The away team uses the time portal to travel back to the past to put a stop to the aliens.

In this 2004 episode, immigrants from the year 3045 arrive through a time portal, looking for jobs.

Keep working on that idea of a force field as a final protection for the time portal.

They'd been in the ruins, ready to go back to the time portal, and then he was here.

I was tossed through some sort of time portal, and went back to 1989.

At least one has been known to function as a time portal.

This opens a time portal and he is sent back into the present.

I do not believe it is a time portal.