Marn worked in Megropolis One on Pluto as Gatherer Hade's assistant.

When the Doctor's TARDIS landed on Pluto, Marn informed Hade of the illegal landing. Together they inspected the craft and Hade told her the story of Kandor, a law breaker from Megropolis Four.

Hade had Marn release the Fourth Doctor from his imprisonment in the Induction Therapy Section of the Correction Centre. She brought him to Hade and gave him a thousand talmars, per Hade's plan to catch him in the act of treason with other conspirators. Despite her allegiance to the Company, Marn appeared to be discomforted by the harsh treatment Hade and his superior, the Collector, inflicted upon the workers.

The Doctor was detected on an oculoid electronic monitor. Marn and Hade went to find him. However, they found the appearance to be a result of a technical fault. When the Citizens' Revolution broke out, Marn surrendered to the rebels, telling them she wished to join their forces. (TV: The Sun Makers)

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