Tantalus V

Tantalus V is a planet. Sometimes its name gets spelled out as Tantalus Five. It seems to be an Autobot-controlled planet.

Fiction

The AllSpark Almanac

Tantalus V was a neutral or unclaimed planet in the Milky Way. The Complete AllSpark Almanac

Intimidation Game

After her ship was destroyed by the Tripredacus Council, Flamewar was found by the Predacons Scourge, Max-B, and Buzz Saw. The Decepticon was taken to a holographic simulation of an Autobot prison on Tantalus Five, where the Predacon trio tested Flamewar's loyalty. After she passed, the illusion was revealed and Flamewar was inducted into Megatron's followers. Intimidation Game

Notes

• Tantalus V comes from the Star Trek: The Original Series episode "Dagger of the Mind".
• It is unclear whether Flamewar was actually taken to Tantalus Five in "Intimidation Game", ir if it was entirely an illusion.