4. Litterbot (2007)
Riff creates a robot that cleans up trash from the park. When the robot malfunctions, it's up to Riff and his friends to lend a helping hand.
Release date: 2007-09-18
Season number: 11
Episode number: 4
Runtime: 15 minutes
Rest of the cast - click here to expand
Bob West - Barney, Adrianne Kangas - Linda, Tory Green - Sarah, Jessica Hinojosa - Maria