The Dalek Section Leader was the leader of a Dalek taskforce on Spiridon.
He was tasked with overseeing the experiments with invisibility. The Section Leader ordered the release of the bacteria to wipe out all life on Spiridon, but a Spiridon named Wester sabotaged the lab room and released the bacteria to make sure the room could not be unsealed without the other Daleks being killed.
The Dalek Supreme later landed on Spiridon and took over control of all operations on Spiridon. The Supreme destroyed the Section Leader for his incompetence. (TV: Planet of the Daleks)
