Vayle

Vayle was an admiral of the Da Gama.

The Seventh Doctor discovered that he was being fed a perpetual hallucination to help him survive the tedium of long distance space flight. However, the programming had gone wrong and there were no other people in the dreams that Vayle was having. After the Doctor found a way out of the virtual environment, he told the controlling computer that Vayle was being driven mad by the lack of companionship. The computer thanked the Doctor for pointing out the "technical hitch", and Vayle's world was soon re-populated with "playmates". (COMIC: Technical Hitch)