Travel between parallel timelines has become possible in the late 21st century.

The 2009 'Star Trek' film creates an "alternate, parallel timeline."

Season six of the series shows, concurrent with the main drama, a secondary narrative in what appears to be a parallel timeline.

Or, rather, a future - a parallel timeline.

"A search program in a parallel timeline?"

Rather, all other incarnations of "Rachel Summers" that exist in parallel timelines (see below) are linked only by having the same name, or attributes.

Instead this one shifted to a parallel timeline.

Additionally, each universe possesses a large ensemble of parallel timelines, which are usually unreachable from each other.

Espers have the potential to spread knowledge or move through parallel timelines without physical transfer.

This alien device may have slipped us sideways into a parallel timeline.