Name – Lesterson
Species – Human
Planet – Vulcan
Temperament – Unhinged
Appearances – Power of The Daleks

Lesterson was Chief Scientist of the Vulcan colony. He believed the Daleks he had found in a crashed ship were robots who could be repaired to help the colony and the Human race in general. In spite of the Doctor's warnings, he repowered them. His mental health was gradually breaking down as the Daleks gained power, but he had enough sense left to realize his mistake.

Death: Lesterson sacrificed his own life to buy the Doctor time to deactivate the Daleks.