Horrid Henry (2006)

S1E10 Who Stole Mr Kill

Horrid Henry's day starts off like any other, but he soon realizes that Mr. Kill has vanished. Channeling his inner detective, Henry searches his home and questions those who might be seeking revenge for his previous mischief. Despite his efforts, he finds no leads. Frustrated, he concludes that the best person to confront about his disappearance is none other than Perfect Peter, who might just have the perfect motive for revenge against him.