Horrid Henry Season 5 Episode 9 Horrid Henry: Planet of the Grapes / Horrid Henry: Eternal Schoolboy Episode Title: Horrid Henry: Planet of the Grapes / Horrid Henry: Eternal Schoolboy Episode Description: Horrid Henry: Planet of the Grapes:Henry tricks Peter into convincing him that he has found a planet through his telescope. Peter does not know that the supposed planet is actually a grape. Horrid Henry: Eternal Schoolboy:Henry sees what the world would be like if he didn’t age. He finds some unexpected paths in the student’s lives.