Spotless Samuel "Sam" is one of Perfect Peter's best friends. He's a member of Peter's "Best Boys Club". He is friends with Goody Goody Gordon, Perfect Peter and Tidy Ted. He is in Miss Lovely`s classroom.
In the TV series, Sam wears a white t-shirt with a purple stripe, blue trousers, black shoes and he has black hair.
- Horrid Henry and the Fangmangler (from Horrid Henry's Nits)
- Perfect Peter's Pirate Party (from Horrid Henry Robs the Bank)
- Horrid Henry Tricks and Treats- Sam is tricked into giving Henry his treats on Halloween
- Horrid Henry's Sports Day - During the egg and spoon race, Sam slips on a broken egg and his own lands on his head
- Horrid Henry's Horrid Revenge - Sam, along with the rest of the Best Boys Club, gets into trouble when he is tricked by Henry
- Horrid Henry Runs Away - Sam is at a Best Boys Club meeting when Henry tries to retrieve his suitcase
- Horrid Henry Makes Some Money- In the TV version of Horrid Henry and the Fangmangler, Sam is frightened by Henry's Fangmangler joke
- Happy Birthday Peter!- Sam attends Peter's birthday party
- Perfect Peter's Revenge - Sam helps Peter with his revenge on Henry
- Horrid Henry and the Perfect Plant - In Henry's dream, Sam is eaten by the plant
- Horrid Henry and the Best Boys Sleepover - Sam attends Peter's sleepover, but he's sented home after they make the bath collapse onto the TV
- Perfect Peter Pumps Up - Sam witnesses Bossy Bill being horrible to Peter