Back to School Hey Arnold! : Season 4 Episode 15
TV-Y7 Nickelodeon 15m
Aired: November 6th, 1999 @ 6:30 PM EST on Nickelodeon
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.
