Dobson (The Ambassadors of Death)

Dobson was a scientist at Space Control and Dr Bruno Taltalian's chief assistant. He helped Liz Shaw and the Third Doctor decode an alien message. He was secretly working for General Carrington and warned him that the Doctor was getting close to decoding the message. (TV: The Ambassadors of Death)

Behind the scenes
Dobson's name is never given in on-screen dialogue; his name is only given in the closing credits.