Beaus' species

Beaus' species are a sapient extra-galactic race, regarded in the 40th century as one of the great powers of the outer galaxies. They hail from the Miron systems. In the year 4000, a representative of this species became one of several allies of the Daleks in their planned invasion of the Milky Way.

Biology
Members of this species are humanoids with Human-like faces, who breathe a chlorine atmosphere and need to wear pressure suits to survive on other planets. Their minds are communal, forming a collective intelligence. Being completely isolated from the gestalt results in death for them.

Culture and society
This species appears imperialist, as they longed for conquest and territory expansion, which prompted them to join the Galactic Council in an alliance with the Daleks.

Technology
To survive in other atmospheres, members of this species utilize black space suits with white helmets and a dark visor, with a white tube connecting their helmets to their chlorine atmosphere tanks. To keep each member of this species connected to their hive mind, each suit is equipped with a radio antenna that keeps them in contact with their brethren.

Appearances

 * Doctor Who, season 3, "Mission to the Unknown" (1965)
 * Doctor Who, season 3, "The Daleks' Master Plan" (1965)