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A friendly reminder regarding spoilers! As always, the expanded Trek universe is in a period of major upheaval with the continuations of Strange New Worlds and Prodigy, the advent of new eras in gaming with the Star Trek Adventures RPG and Star Trek Online, as well as other eventful releases such as Section 31, the ongoing IDW Star Trek comic and spin-off Star Trek: Defiant. Therefore, please be courteous to other users who may not be aware of current developments by using the {{spoiler}}, {{spoilers}} OR {{majorspoiler}} tags when adding new information from sources less than six months old (even if it is minor info). Also, please do not include details in the summary bar when editing pages and do not anticipate making additions relating to sources not yet in release. THANK YOU

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Memory Beta, non-canon Star Trek Wiki

The Grandfather paradox is a paradoxical situation arising in time travel. Supposing a time traveler went back in time and killed his grandfather before siring the traveler's father - the traveled would never exist to travel back in time in the first place and could never have killed his grandfather. The term is more generally applied to any situation or action which would logically make impossible the ability to travel backwards through time in the first place. (DS9 - Millennium novel: The War of the Prophets)

When Montgomery Scott went back in time to attempt to save James T. Kirk before he could be absorbed into the Nexus, he was concerned about the timing of transporting Kirk off the USS Enterprise-B; too early, and the Enterprise would not be able to break away from the energy ribbon, and the Scott of the time would be killed, and logically unable to travel back in time. (Star Trek novel: Engines of Destiny)

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