10 Star Trek Episodes If You Hate Happy Endings

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There are times when Star Trek sets aside its status as a bastion of optimism and hope for the future, and delivers episodes that prove heartbreak will remain a universal constant, even in the utopia that is the United Federation of Planets. Trauma, wrongful imprisonment, senseless character deaths, lost loves, and even tragic transporter malfunctions are all to blame for the pain inflicted by Star Trek episodes with downer endings.
Jen Watson

https://screenrant.com/star-trek-episodes-no-happy-ending/