Dortmun

Dortmun was a freedom fighter on Earth during the Daleks' invasion and occupation of Earth (2157 - 2167). He was disabled and confined to a wheelchair.

Biography
Dortmun developed a bomb that 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 confronted a Dalek which exterminated him. (DW: The Dalek Invasion of Earth)