Name – Barclay
Species – Human
Planet – Earth
Temperament – very worried
Appearances – The Tenth Planet

Barclay was an Australian physicist at the Snowcap Space Tracking Station at the time of the Mondasian Cybermen invasion. He helped the Doctor, Ben and Polly defeat the Mondasian Cybermen and prevent General Cutler from using the Z-Bomb which would have doomed both Earth and Mondas.