Thessin

Thessin is an ice planet.

Fiction

Marvel Comics continuity

Marvel The Transformers comics

Thessin appeared exclusively in the UK portion of the Marvel Comics continuity.

When the Firebugs fled their home planet of Furnacia, most of them ended up on Thessin. The world was inhospitable to them and some people assume the Firebugs went extinct. Firebug!

The AllSpark Almanac

Thessin lies close to Furnacia. It's unclaimed by any of the galaxy's major players. The AllSpark Almanac II