Hey Arnold!
Back to School (4x15)
Date de diffusion: Sept 11, 1999
Grandpa's dream was always to get a High-School Diploma, but he never did because he had to work, so Arnold tries to make him go through grade school over again to fulfill his dream.
- Première: Oct 1996
- Épisodes: 209
- Abonnés: 127
- Fini
- Nickelodeon
- Daily à 18