Gustave Lytton

Commander Lytton was a mercenary. He was born on the satellite Riften 5, orbiting the planet Vita 15.

Mercenary for the Daleks
When Fifth Doctor encountered Lytton he was working for the Daleks in a plot to rescue Davros from imprisonment in stasis on a human prison station. (DW: Resurrection of the Daleks) When Davros altered some of the Daleks to be loyal to him and attempted to seize control from the Dalek Supreme, Lytton was one of the few survivors of the ensuing battle and was left trapped on 20th century Earth.

Working with the Cryons
Sixth Doctor encountered Lytton (once more) during what appeared to be a plan to rob a diamond merchant. The sewers through which he planned to make his heist uncovered a squad of Cybermen. Lytton was taken to Telos with the Cybermen and the Sixth Doctor. (DW: Attack of the Cybermen) Whilst on Telos it was revealed to the Doctor that Lytton was working for the Cryons following their own agenda.

The Cybermen had travelled back in time to prevent the destruction of their home planet Mondas in 1986. However, once they did so the Cybermen intended to destroy and leave Telos. Lytton's mission was to prevent this by stealing the time machine.

Once Lytton's treachery to the Cybermen was exposed, the Cyber-Controller ordered that Lytton undergo the cyber-conversion process. The Doctor tried to free Lytton from his fate as a Cyberman, a partially converted Lytton died fighting the Cyber Controller. The Doctor later admitted that he had badly misjudged Lytton. (DW: Attack of the Cybermen)