Io

Io is a moon of Jupiter. In real life, it is notable for its sulphur volcanoes. In the Transformers universe, however, it is the home of psychotic alien bats that transform into missiles.

Cartoon continuity
Blurr and Wheelie crashed on Io while deliveringMetroplex's transformation cog to Earth, where they were attacked by the local wildlife. They were soon joined byMarissa Faireborne, courtesy of the locals' skills as kamekaze pilots. All three had to be rescued by the Autobots' current ride.

Exosquad
Io, the innermost of Jupiter's Galilean moons, served as temporary base for Admiral Winfield's Exofleet remnant in the first years of the war. It became a critical home base for a time after the destruction of the Resolute and much of the fleet. The moon has seen several fierce battles but in the end, General Typhonus forced Exofleet to retreat further away from the Homeworlds. However, by then, Winfield has already allied himself with Jonas Simbacca, who provided him with a new base - Chaos.