The time barrier was the construct that had to be broken to enter temporal displacement and travel along the space-time continuum.

It was first broken by Emmett Brown's dog Einstein in the DeLorean time machine at 1:20:00 am, Saturday October 26, 1985.

Appearances

• Back to the Future trilogy (mentioned alongside "temporal displacement")

Sources

• Back to the Future: The Official Book of the Complete Movie Trilogy