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 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, so 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)