- You may be looking for the Dalek named Beta.
Beta was a Gond scientist who lived under the enslaving regime of the Krotons.
Biography[]
Beta resented being forced to accept knowledge as he wanted to discover new things for himself, and he enjoyed experimenting with chemistry, which was forbidden by order of the Krotons because acids were dangerous to them.
Beta and Jamie attacked the exterior of the Krotons' ship with sulphuric acid, while the Second Doctor and Zoe applied acid to the interior. This action was the proximate cause of the successful end of the rebellion.
Before deciding to assist the TARDIS crew, and by extension Thara, Beta had been heavily courted by Eelek, who was angling for post-Kroton, post-Selris power in a free Gond society. Consequently, Beta's fortunes likely rose in the aftermath of the rebellion, once Thara had become leader of the Gonds.
Beta's attire was notably different from other Gonds as he had white bands around the sleeves, waist and calves, rather than the dark bands worn by most Gonds. (TV: The Krotons)