Silas P

Silas P was a secret agent for the Happiness Patrol, who hunted down people on Terra Alpha who were not happy.

Biography
Silas P successfully captured a Killjoy named Daphne S, and was awarded with a promoting badge by Helen A.

He later led another recently arrested killjoy, who was Harold V's brother, into the execution chamber, placing him beneath a large metal pipe to be sentenced to death by drowning in boiling candy.

Silas P tried to capture the Seventh Doctor, who was known as "Doctor Sigma" on Terra Alpha, but Earl Sigma arrived and helped the Doctor escape by knocking the agent unconscious.

The Happiness Patrol then shot Silas P for not looking happy. (TV: The Happiness Patrol)