|Full Name||Leonard Bicknall|
|Occupation||M.I.9 Spy Handler, Caretaker|
|First Episode||The Sinister Prime Minister|
|Last Episode||Asteroid Attack|
|Portrayed By||Danny John-Jules|
He was an M.I.9 agent deep undercover posing as Saint Hope's School's caretaker. He has been with M.I.9 for many years and has been involved in several espionage missions. His storeroom is the secret entrance to the M.I.9 base, deep beneath the school. He has his own personal spy gadgets including a signalling device concealed within the handle of his broom, which he uses when in caretaker disguise to contact agents under his care. Lenny moves on from M.I.High before Series 3, and is replaced by Frank London.
- In the episode, "Spy Animals", it is discovered that Lenny and Miss Templeman like each other.
- In the episode, "Face Off", we learn about Lenny's history.
- In the episode, "You Can Call Me Al", it is revealed Lenny had a laser tooth in his mouth.