The Pteranodon family explore a new train, the Solar Train, and learn that it's powered by the sun!
Mr. Conductor races the Dinosaur Train against two other trains that run on alternative energy sources.
George and Steve volunteer to deliver Betsy's xylophone to a school concert. When it comes time to move the xylophone, George and Steve remove all of the keys, but when they get to school, George can't remember what order they go in! Can he fix them in time for Betsy's concert?
Maria explains to Zoe and Abby that a quinceanera is a party that some Latinas have when they turn 15. Just then, a number 15 walks by and announces that she's never had a quinceanera! With help from Telly and Mando, Zoe and Abby decide to throw 15 a quinceanera. There's just one problem -- 15 wants there to be fifteen of everything at the party! Can Abby and Zoe do it in time?
Martha is hit with a stark realization: the Tooth Fairy doesn't like dogs. Determined to right a wrong, Martha and Skits bound boldly into the night as the Puppy Tooth Fairies. The problem is puppies lose a lot of teeth. So do kittens and elephants and... whales?
George and the Man with the Yellow Hat visit the attic to find an umbrella, but end up discovering much more!
George hits a button on the apple press, which puts the press in motion and squishes all the Renkins apples. George needs to figure out how to stop the machine.
What kind of animal made the mysterious footprints beside the pond? George investigates!
George is excited about his friend's party--so excited that he can't stop dancing!
Sid and his friends embark on a quest to explore all five senses--vision, hearing, touch, smell and taste!
George helps out at the concessions stand at the movie theater.
Mr. Conductor takes the Pteranodons back to the beginning of the Triassic period to answer Buddy and Tiny's question about whether it really was the beginning of time. The Pteranodons walk back in time and learn about what existed before the Triassic period.
Since Arthur will be gone during the weekend, he and Buster try to have twice as much fun during the week.
It's impossible. It's unthinkable. It's unbearable. Helen is leaving Martha and going to art camp during the summer. Full of separation anxiety, Martha's melancholy clouds even her ability to help T.D. take off his shoes. Feeling blue without her companion, Helen pours her feelings into her paintings.
George tackles the tightrope as a circus performer!
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