How does glue work? Mr. Wonderful can't start his show until Bang gets to the bottom of this sticky question. Common guest-stars.

To build a sandcastle, a royal architect wants to know where sand comes from. It's up to Bo to get to the nitty gritty. Sophie Turner guest-stars.

Mr. Awesome Ultra Guy is curious about budgets, so Bing pays a visit to the bank. Kevin Smith guest-stars.

Ms. Mushroom wants to learn how to taste better. To find out more, Bo goes to see her favorite band, the Taste Buds. Chrissy Teigen guest-stars.

Boop visits the Chemical Department to answer a burning question for Mr. Super Snowy Icy Cone Guy: How is ice made? Patton Oswalt guest-stars.

Bing takes a spin to the Department of Bodily Functions to help Mr. Karate Guy understand why people get dizzy. Gabriel Iglesias guest-stars.

A lost tourist wants to know how GPS works, so Beep travels to Old Willy's map to learn more. Craig Robinson guest-stars.

Cosmic Caller thinks he found an alien code, but something's not adding up. Bing talks to Alabama Smith to figure things out. Rainn Wilson guest-stars.

Before his big show, the Great Bubblini is bursting to know how bubbles form. Bang heads to the laundromat to find out. Josh Gad guest-stars.

When Disco Delilah asks how many tiles she'll need for her dance floor, Beep steps up to learn more about area. Wendi McLendon-Covey guest-stars.

Bo explores why the moon seems to change shape to help Ms. Astronaut Lady safely land her spaceship. Scarlett Johansson guest-stars.

Ms. Firefighter has a burning question about taxes, so Boop visits the Department of Government and Stuff. Gabrielle Union guest-stars.

Beep takes a spin with documentarian Chase Weathers to answer Mr. Cow's question about how tornadoes form. Joe Lo Truglio guest-stars.

Where does glass come from? Mr. Castaway can't make windows for his house until Bo cracks this question. Steve Buscemi guest-stars.

After Ms. Cafeteria Worker Lady's refrigerator stops working, Bing visits the Refrigadome to learn more about cooling. Kristen Bell guest-stars.

Boop travels to the Archive Department to help the all-knowing Socradamus with a fundamental question: What is stuff made of? Simu Liu guest-stars.

When Ms. Clown gets an offer to invest in e-Digital-Clown-Circus-World.com, Bang pays a visit to a TV show about stocks. Julie Bowen guest-stars.

Bo looks into how the internet works after an office worker named Stacy accidentally sends a silly video to his boss. Trevor Noah guest-stars.

Bing races to ask runner Speedy Lightning a question about finding the fastest route for Ms. Pizza Delivery Lady. Jessica Alba guest-stars.

Something's not adding up for Giuseppe the pizza guy, but Beep totally knows how to help — multiplication! Danny DeVito guest-stars.

When a secret agent asks the StoryBots about lasers, Bang shoots the question to a photon named Frans. Anne Hathaway guest-stars.

When a cat burglar has a question about keys, Boop goes to Security Hardware Headquarters to unlock the answer. Zooey Deschanel guest-stars.