Summary: Argh! The twins encounter space pirates, a Scotsman and ice cream people as they learn about free trade and why no one can make a pencil by themselves.
This episode contains the following tropes:
- An Aesop: "Free trade gets stuff made."
- The Bully: Bruce constantly picks on Ethan and refuses to trade with him. But only because his role in the show is to act as a metaphor for certain nations that refuse to engage in free trade and thus deny themselves its mutual benefits. A role he's well aware of.
- Cassandra Truth: Karinne tries to convince her teacher that she saw Grandma Gabby and the twins take off in the wheelchair. Her teacher naturally doesn't believe her.
- Extreme Omnivore: Derek gets into Emily's backpack and eats everything in it. Literally everything.
- Historical Domain Character: This episode's guest is Adam Smith.
- Level Ate: The second half of the episode deposits the characters in a world called Ice Cream Land.
- Shout-Out: When Gabby drops Adam Smith back in his time, he splashes his face with blue paint and shouts, "Freedom!" as he dives off the wheelchair.
- Trauma Button: Don't ask Ethan about his dead goldfish.
- Violent Glaswegian: The owner of the tavern takes deep offense to the fact that Adam Smith doesn't like his mother's carp recipe. Though it should be noted that he lives in Edinburgh.
