Keeping the timeline intact is hard. Just ask the Avengers. Or the Legends of Tomorrow. Or Back to the Future’s Doc Brown, Army of Darkness’ Ash, or… well, you get the idea. About the best a time-traveler can hope for is to metaphorically step on a butterfly that doesn’t have too big an effect on the future. As such,…
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Source : 11 Fairly Competent Time Travelers
