Irwin Allen's The Time Tunnel

In 1979, 20 years after it was set up, Project Tic-Toc was shut down by the American authorities, all hope of retrieving scientists Tony Newman and Doug Phillips, who were lost in the Time Tunnel during 1968, has been abandoned.

In 2025, four people are brought together by a need to reopen the Arizona base and reactivate the Time Tunnel in secret. From there they must try to find Doug or Tony, because something they have done in the past has changed the present. And not changed it for the better... the world is now under the power of Rakervia.