provides a definition in a brief essay on his own fiction: "The timestream is an alternate history device used in Rick Sutcliffe's fiction. It is the medium in which the various alternate earths exist, or, if one prefers, it provides the connections among them, in the manner of C. S. Lewis' wood between the worlds -- a place between." While not discussing the timestream per se, scholar John Grant discusses a related topic, that of the time slip: "Generally protagonists [return] to their starting points but a frequent device is that, after repeated timeslips, the 'traveler' chooses to remain in the other period. Generally there is an emotional or psychological connection of some kind between the character and the earlier time — most often love... Unsurprisingly, timeslips are a staple of the subgenre of romance fiction called the Paranormal Romance, exemplified by Diana Gabaldson's Outlander (1991) and its sequels." Examples Examples of the usage of timestream: In DC Comics, the timestream is an invisible current that flows through the DC Universe. It is used as a way for heroes like the Linear Men, and especially Waverider, to travel and correct time fluctuations from time traveling supervillains who seek to alter the correct reality. The timestream was mainly used by Waverider during Armageddon 2001, Death of Superman, and Zero Hour events. The timestream is connected to the Speed Force, so speedsters are able to tap into certain points in it in order to time travel. It is possible Per Degaton, Chronos, Vandal Savage, Hourman, Max Mercury, Savitar and Epoch, has also used the same type of time stream for time travel. In the Legacy of Kain game series, the timestream's nature (as to whether or not it can be changed) plays a vital role throughout the story. Similarly, in Three Days to Never by Tim Powers, various individuals and groups try to find and control a time machine, hoping to travel back in time, make changes to events, and thereby enter a parallel universe in which they might find themselves experiencing a happier life. Powers also explicitly links time travel with rivers in his 1983 novel The Anubis Gates. In the Terra Nova (TV series), the Terra Nova settlement exists in a different timestream, so that it doesn't affect the future of 2149, from where the settlers arrive. To decide upon where (and when) to start the settlement, a timeprobe is