The StoryBots brave a castle to understand how eyesight works; Maria Bamford guest stars as an eccentric scientist.
A trip to a landfill teaches the StoryBots the importance of recycling; Tony Hale guest stars as the owner of a sorting facility.
DNA is the reason why no two people are exactly alike; Reggie Watts guest stars as a nurse who explains DNA.
The StoryBots enter a vending machine to find out where candy bars come from; Alyssa Milano guest stars as a chocolatier.
The StoryBots tumble into a tuba and enter a musical wonderland; John Legend guest stars as the King of Music.
The StoryBots take off into outer space to learn how planets are made; Zoe Saldana guest stars as an astronomy professor.
The StoryBots hop inside a cell phone to see how it works; Jennifer Garner guest stars as a cell tower switching-station operator.
The StoryBots find out how toilets work and where the waste goes; Jason Sudeikis guest stars as a plumber.