Fix the Present!

Using their time viewer, three scientists see a desolate landscape 107 years in the future, at which point the electrician realizes that the viewer has unexpectedly become a portal. All four jump through, only to have the portal collapse behind them, whereupon they are chased on the surface by Morlockish mutants who are afraid of thrown rocks, and they meet an advanced, post-apocalyptic, underground society that employs androids and is planning a generation-long trip to Alpha Centauri.

The film draws in at least four important additional time travel tropes: suspended animation, a single consistent timeline (with the corresponding inability to go back and change it), experiencing the passage of time at different rates, and a trip to the far future. And according to the SF Encyclopedia, the film was originally conceived as a sequel to the 1960 film of The Time Machine. —Michael Main

The cinematic vision of writer/director Seth Larney was beyond his grasp in this story of a Philip K. Dick-esque future where all plant life has been killed off, an evil corporation has cornered the market in artificial oxygen, and a lowly utility worker with a dying wife is called four centuries into the future by a successfully executed causal loop accompanied by the usual kind of unexplained skeleton timeline. —Michael Main