Edwardes was the communications officer on the starliner Hyperion III under Commodore Travers in 2986. He detected the Doctor's TARDIS on the scanners, but was unable to get a reply. He was then knocked out by an unknown man. He later reported to Travers and went to the sickbay to get examined.
He was later in the loading bay when he spotted Mel Bush wandering around. Edwardes then agreed to take her on a tour of the hydroponics section. When he went to open the door, he was electrocuted and killed by a trap set by Doland. This caused the Vervoids to awaken. (TV: Terror of the Vervoids)