Serton

The outer rim planet Serton is a small, watery world with nice weather. It's inhabited by a civilization of friendly, diminutive robots who use shells as currency.

Fiction

The Invisibility Factor

The elderly Autobot Kup was once stationed there, where he encountered a spaceship with similar invisibility capabilities to the one possessed by Sarah Sanders.

After the Decepticons' plot to steal Sarah Sanders's invisibility technology had been foiled by Hot Rod and the Autobots, Sarah took off in her ship, vowing never to let it fall into dangerous hands. As she left, Kup reminisced about his days on Serton, and began one of his stories about his adventures there. The Invisibility Factor

Spacewarp's Log

At some point, a lost Insecticon patrol crash-landed on Serton, and discovered the ruined city of Sertlandia. One of their number interfaced with the city's database, becoming Chromhorn. Chromhorn sent his troops out to raid local villages for slaves in order to rebuild the ancient Sertlandians' Temporal Analysis & Replication Dampening Interference Subjugator, which would allow him to control his own destiny.

The visiting Decepticon Spacewarp was lying low in the city of Azurala when the local cabana-bots paid her to investigate rumors of sea monsters abducting villagers. To keep the powerful TARDIS out of Chromhorn's possession, Spacewarp and her crew tried to take it for themselves, only to be confronted by the Insecticons. Spacewarp tricked Chromhorn into turning the TARDIS on, and Chromhorn was trapped in his own increasingly unlikely future.

Grateful for the rescue, the freed captives tried to make Spacewarp their queen, but she declined, wanting to move on. One of the shells she received as payment turned out to be an ancient Sertlantian time window, which Spacewarp kept as a useful souvenir. Ask Vector Prime, 29/10/2015