Mechma Onzlo III Station was a space station located in the Ansaara system, home to Onzlo and Marteek.
The Tenth Doctor visited the station to find a device that could record temporal wakes and detect vortex spills. Onzlo gave him Marcie, a Xerobian Quantisized Radiant Core Monitor and left the station. (COMIC: Vortex Butterflies)
He later returned to try and fix Marcie, but they were chased off by an impostor posing as Marteek, who had acquired a device that the Doctor called a time engine. (COMIC: The Good Companion)