The last few decades have delivered an impressive wave of sci-fi TV shows that pushed the boundaries of imagination, storytelling, and character development. Many of them started with extraordinary promise, gripping fans with inventive premises and layered mysteries. However, for every triumph, there were disappointments - series that stumbled in their final moments or made narrative choices that simply didn’t live up to expectations.

While some sci-fi shows merely lost steam and failed to close on the same high note they began with, others went further, frustrating their fans with endings that felt like betrayals. These weren’t cases of premature cancellation or outside interference; instead, they were shows that concluded in ways that actively undermined the journeys viewers had i

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