Dortmun

Dortmun was a freedom fighter on Earth during the Daleks' invasion and occupation of Earth. He was disabled and confined to a wheelchair.

Biography
Dortmun developed a bomb he hoped would be effective against the Daleks, but it failed. He wanted to set about developing a new bomb, but was forced to go on the run when the Daleks began searching for the rebel hideout. He gave Barbara Wright his notes to give to the First Doctor. He attempted to use his new bomb on a Dalek patrol in London, but was killed in the attempt. (TV: The Dalek Invasion of Earth)

Behind the scenes

 * Dortmun was portrayed by Godfrey Quigley in Daleks' Invasion Earth 2150 A.D., which mostly retold the story of The Dalek Invasion of Earth.