The Grand Daddy Of All Inventions Dexter's Laboratory : Season 3 Episode 9
TV-G Cartoon Network 23m int(0)
Aired: June 21st, 2002 @ 1:00 PM EST on Cartoon Network
Dexter's mom takes him to his grandpa's house. At first he thinks it's going to be a boring day until he discovers that his grandpa has a secret lab!