Horrid Henry (2006)

S1E43 Perfect Peter's Revenge

Title: Perfect Peter's Comeback Plot: After being pushed to his limits by Henry's antics, Peter devises a plan to get back at him. He decides to write a love letter to Moody Margaret, intending to stir up trouble until Henry admits his misdeeds. The plan backfires when Henry’s confession leads to unexpected consequences, landing him in detention.