The mysterious Molepheus takes the StoryBots on an underground journey to learn how French fries are made."Weird Al" Yankovic guest stars.

The StoryBots visit mountaintops, the deep sea and even outer space to understand how night happens. Jay Leno guest stars as a helpful knight.

To learn why the sky is blue, the StoryBots get a science lesson in colors. Garfunkel and Oates' Riki Lindhome and Kate Micucci guest star.

The StoryBots visit an amusement park in the sky to learn where rain comes from. Tim Meadows and Chris Parnell guest star as a pair of silly reindeer.

The StoryBots embark on a high-flying adventure to learn how airplanes fly. Kevin Smith guest stars as the superhero Super Mega Awesome Ultra Guy.

To understand why humans need to brush their teeth, the StoryBots travel to a mouth taken over by a gang of bad bacteria. Whoopi Goldberg guest stars.

The StoryBots climb inside a computer to learn about input, output and processing. Snoop Dogg guest-stars as a tech-savvy operating system.

A piece of broccoli and a rebellious cupcake teach the StoryBots about proper nutrition. Christina Applegate guest-stars as a bakery owner.

The StoryBots take on an awfully big task: counting every kind of animal there is. Kristen Schaal guest-stars as a biologist.

A talking boombox turns it up to show the StoryBots how ears help us hear. Ali Wong guest-stars as an all-knowing brain.

The StoryBots help the lead of a subterranean musical deal with the pressures of fame. David Koechner guest-stars as a pirate.

To find out where electricity comes from, the StoryBots go straight to the source. Edward Norton guest-stars as an electronics salesman.

The StoryBots get a bug's-eye view of a flower's journey, from seed to bloom. David Cross guest-stars as Bang's free-spirited pal.

The StoryBots travel to the Land of the Lymph to learn how a cold virus spreads. Wanda Sykes guest-stars as a doctor with the sniffles.

After tumbling into a tuba, the StoryBots enter a magical, musical wonderland. John Legend guest-stars as the King of Music.

The 'Bots blast off into outer space to learn how planets are made -- and what they're made of. Zoe Saldana guest-stars as an astronomy professor.

No two people are exactly alike, thanks to a little thing called DNA. Reggie Watts guest-stars as a nurse who explains it all.

A trip to a landfill teeming with trash teaches the StoryBots the importance of recycling. Tony Hale guest-stars as the owner of a sorting facility.

To see how cell phones work, the StoryBots hop inside one. Jennifer Garner guest-stars as a cell tower switching-station operator.

We use the toilet every day, but how does it work -- and where does our waste go? Jason Sudeikis guest-stars as a plumber in the know.

The StoryBots jump into a vending machine to find out where candy bars come from. Alyssa Milano guest-stars as a chocolatier.

The StoryBots brave a castle on a dark and stormy night to understand how eyesight works. Maria Bamford guest-stars as an eccentric scientist.