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Author: Stratadrake

Feb 7th 2012 at 11:07:58 AM

In Harry Potter, when using the Time Turner Hermione explicitly warns Harry that they can't risk coming into contact with their other selves, because "awful things" have happened to wizards who mess with time too much.
In ''BackToTheFuture 2'', in 2015 an elderly Biff Tannen stole the DeLorean to give a sports almanac to his 1955 younger self; yielding changes to the timeline that erase him from the timeline (and turn 1985 into a Biff Tannen ruled city), and Marty and Doc must go back to 1955 again to recover and destroy the almanac, all while avoiding contact with their previous selves from the first film.

In one episode of StarTrekVoyager, the timeship Relativity was attempting to apprehend a rogue captain (Bragston) who had planted a temporal bomb on Voyager at some point.  Seven of Nine interacted with her former self at one point to catch him, but then they conscript Janeway to track down an earlier version of Bragston.  Janeway doesn't interact with her former self, but is momentarily stopped by Tauros from Engineering in the process.  The Relativity crew states that each version of Bragston will be "properly re-integrated" into their respective timelines in time for trial.