Scrofolus

Dr  was employed on the Dollar Intergalactic project of terraforming Isen VI in the 25th century.

He was an aquatic creature and required a liquid-filled helm to operate alongside his colleagues.

When the pod of his Team 12 was caught in a sudden earthquake, the Twelfth Doctor saved the team by landing the TARDIS inside the pod.

Later Scrofolus helped the Doctor and Clara Oswald to defeat Rann-Korr. (COMIC: Terrorformer)