Gearon's species

Gearon's species are a sapient extra-galactic race, regarded in the 40th century as one of the great powers of the outer galaxies. 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.

It appears that Gearon is the name of their planet, their species and their representative.

Biology
Members of this species are humanoids with egg-shaped heads and no faces. Although their heads appear to be featureless, they seem to have eyes or be otherwise sensitive to light in some way.

Having evolved in an almost perpetually dark planet, members of this species need to wear protective visors to compensate for the excessive light when interacting with most other races.

Appearances

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