Aura Penthe (Star Trek 6: City of the Future)
The Klingon's prison planet is covered in ice and snow all year round, crammed with a variety of interstellar criminals, from rough aliens to deforming supermodels. This small planet is located in the Beta Penthe galaxy, and prisoners often don't live more than a year after arriving here. They spend most of their time digging in suffocating caves and trying not to be eaten by stray jackals.
Planet Goris IX (Transformers)
Located on the planet Elba, Goris IX is the safest Autobot prison. Nicknamed "G-9" in the IDW Transformers comics, he imprisons the Decepticons and the Autobots.
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