Cell guard

A cell guard working for Earth Security was assigned to fetch the Third Doctor and Jo Grant from their cell on Earth for a second interview with President of Earth Dora. (TV: Frontier in Space)

Behind the scenes
Because the BBC reused the credit roll from episode one on episode two, actor Timothy Craven was not credited for this role. This error was not corrected in any home video release, not even in the 2009 DVD. Oddly, however, the info text on the DVD makes reference to the error.