Time travel is an incredibly difficult plot device to get right. Science fiction typically has no problem coming up with plausible ways to explain elements that don't actually exist, but different rules apply to time travel. It's a concept that completely defies the laws of physics, making it a little too easy for writers who don't know exactly what they're doing to create logical paradoxes and inconsistencies that make it hard to fully immerse oneself in a show that incorporates time travel.
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