Harold V was a Killjoy who had been Helen A's gag writer and was then called Harold F.
After his brother disappeared, Harold investigated and discovered that several other people had also disappeared, which prompted him to contact Earth for help. However, he was captured and taken to a waiting zone by the Happiness Patrol.
He was present at the waiting zone when the Seventh Doctor and Ace were arrested. He was playing a slot machine when Helen A used the machine to electrocute Harold, killing him. (TV: The Happiness Patrol)
