Xavier learns all about playing the recorder when he meets Johann Sebastian Bach.

Marie Curie inspires Brad to follow his dreams.

The kids meet spooky storyteller Mary Shelley who shows Xavier how to tell a story that is both spooky and silly.

Harry Houdini teaches Brad how to keep calm when he's scared.

Yadina is excited when she's chosen to be the leader of her Nature Troop, thinking this a great first step toward becoming President one day. Only problem is, she isn't entirely sure how to be a good leader.

Susan B. Anthony helps Brad show his friends that everyone should have a vote.

Xavier tries mini golf for the first time, and things don't exactly go as planned. No matter how hard and fast he swings, the ball never goes in the hole... To the Secret Museum! Our trio are sent back in time to meet an expert in the laws of motion: Sir Isaac Newton. Isaac is in the middle of his own problem, trying to figure out how he can out jump boys who are clearly bigger than him.

Golda Meir shows Yadina that she should tell people when there's a big problem, so it can be solved together.

Brad meets Winston Churchill and learns the importance of speaking up for yourself

Xavier talks to Cleopatra about how to ask his parents if he can stay up late to see the super moon.

Catherine the Great eases Brad's fears about going to day camp without his best friends.

Yadina is unsure about bringing an old quilt for show and tell, but artist Tomioka Tessai helps her realize the best items are ones connected to family.

Despite all the cracked eggs, the Wright Brothers encourage Xavier and Yadina to continue their egg drop experiment.

The Bronte Sisters help Brad overcome writer's block.

Xavier is afraid he will be unable to perform his comedy show after he hurts his wrist, but Mark Twain shows him that laughter can make hard things easier.

Abigail Adams helps Yadina realize that a missing color will not ruin her painting.

Watching Julia Child follow a step-by-step recipe encourages Xavier to do the same to build a model airplane.

Neil Armstrong inspires Yadina to try new things.

Helen Keller teaches Yadina that there are many different ways to learn.

Alexander Graham Bell shows Xavier and Yadina how to help Brad after he loses his voice.

Florence Nightingale shows Xavier and Brad why they should work hard to help cure Yadina’s hiccups, because it’s important to help others as best they can.

George Washington Carver shows Xavier just how important plant life is, and why we all need to help take care of the Earth.

Leonardo da Vinci shows Xavier that he doesn’t have to pick just one after-school activity, because it’s okay to try many different activities.

Amelia Earhart shows Brad that if there’s something he really wants to do, like ride in the bike rodeo, he should go for it.

Zora Neale Hurston helps Brad feel more comfortable sharing a personal story he wrote, by showing him that stories are best when you share them with others.

Charles Dickens shows Yadina that she doesn’t need new toys, because her imagination can make everything more fun.

Jackie Robinson helps Yadina when a child on the playground makes up rules that are unfair.

Anna Pavlova encourages Xavier not to give up being a magician just because he made a few mistakes.

Mary Leaky helps Xavier develop a strategy for a difficult scavenger hunt -- slow down and look around.

Alexander Hamilton helps Yadina realize that starting first grade is an exciting adventure.

Theodore Roosevelt helps Brad overcome his dislike of creepy crawly things, showing him that nature needs space to live and grow.

Eleanor Roosevelt teaches Xavier that any job can be amazing as long as you help others.

Lou Gehrig helps the gang focus on the good stuff rather than moping about a few bad breaks.

Marie Owens shows Xavier, Yadina and Brad how to solve problems in a positive way.

Xavier is upset thinking he won't be able to bring the museum to his friend in Japan, but Nikola Tesla encourages him not to give up.

Nellie Bly helps Yadina overcome her fear of the monkey bars.

An argument between Xavier and Yadina ends badly, but Maya Angelou helps the siblings find a way to forgive each other.

Frederick Douglass helps Xavier when he becomes frustrated with his schoolwork.

Louis Pasteur helps Xavier with his volcano experiment project.

Rachel Carson helps Brad figure out a way to help butterflies migrate.

Brad gives up on hide-and-seek until Kate Warne helps him figure out how to play the game better.

Sir Arthur Conan Doyle helps Xavier decide what to get the new girl in class for her birthday.