In the late 2260s, Doctor Zarlenga was a member of an archaeological team under Professor Jefferson Whitmore, investigating an abandoned relay station on the planet Aprilia III. They spent several months studying the technology of the relay station but found it incomprehensible and inoperable. At some point, Cybermen infiltrated the facility and mind-controlled Zarlenga and the other researchers, making them unemotional and docile.
The away team and the Fourth Doctor later returned to the station and discovered Zarlenga and the archaeologists under Cyberman mind-control. They freed them from the effects and evacuated them while the Cybermen were destroyed. Zarlenga later spoke to Montgomery Scott and the team returned to their work. (COMIC: Assimilation²)