|Place of origin:||Earth|
|Appearance:||The Tenth Planet|
|Main actor:||David Dodimead|
Believing that the Snowcap's military commander, General Cutler, was misguided in his decision to fire the deadly Z-Bomb at Mondas, Barclay collaborated with the First Doctor's companions, Ben Jackson and Polly Wright, to sabotage the launch. When the Cybermen took control of Snowcap, they killed General Cutler and forced Barclay, Ben, John Dyson and Haines to remove the Z-Bomb from the rocket warhead. Barclay then helped Ben, Dyson and Haines use radiation to weaken and defeat the Cybermen.
Behind the scenes Edit
Barclay is given the first name of Tom in the novelisation.