Sesame Street

Hubert the Human Cannonball comes to Sesame Street to be launched out of a cannon into a bucket of blue gelatin. He enlists Baby Bear, Elmo, and Telly to help him, but things don't exactly go as planned! Plus, James Marsden stops by to explain the word "engineer." The fun continues with Abby's Flying Fairy School and Bert and Ernie's Great Adventures. Murray experiments with a rocket, and Elmo lends a helping hand in Elmo's World.

Will it sink or will it float? Zoe wants to help Rocco the rock float, but Rocco is too heavy. Leela sees this as an opportunity for a group experiment, so she, Elmo, and Zoe put their heads together to invent the perfect boat to keep Rocco afloat. Special guest star Craig Ferguson explains what the word "experiment" means. Plus, the fairy friends are building a giant tower over at Abby's Flying Fairy School, and Bert and Ernie are cavemen in Bert and Ernie's Great Adventures. Murray experiments with cars and ramps, and over in Elmo's World, it's all about hands.

It's Bubblefest on Sesame Street! Alan and Chris are in charge, and they've created some fun bubble challenges, including a competition to find the perfect bubble mixture and a pop quiz. But it's Abby and Elmo who blow everyone away with one really big bubble! George Lopez visits the Street to explain what "liquid" is. It's letter "B" day at Abby's Flying Fairy School, and Super Grover 2.0 uses his powers of observation. Finally, Murray experiments with bubbles, and things are very "fishy" in Elmo's World.

Oscar makes a mess in Grouchology class. His professor (Jason Jones) gives an assignment that includes three important objectives: observing, recording, and annoying. This will be the easiest A ever! Special guest Jerry O'Connell explains the word "observe." Smile and say "cheese" for picture day at Abby's Flying Fairy School, and watch as Bert and Ernie become dog-walkers in Bert and Ernie's Great Adventures. Finally, Murray experiments with umbrellas, and pets are popular in Elmo's World.

Marco and pals celebrate Latin culture through song, dance, language, and more. There's a big feast to enjoy too, so as Rosita says, when there's musica, baile, and comida, it's time to have a fiesta with your amigos! Guest star Sofia Vergara explains the word "baile," and singer Juanes performs a Spanish song. Also, lunch becomes enchanted at Abby's Flying Fairy School, and there's more fun in store with Bert and Ernie's Great Adventures. Murray experiments with racquets (tennis, anyone?), and it's time to learn how to get dressed in Elmo's World.

Humpty Dumpty is at a football game when an injured player needs replacing. This could be Humpty's big break, but Telly's in a tizzy because Eggs + Football = Trouble. Telly takes on the challenge of creating a protective second shell for his friend. Will Humpty score a touchdown? Special guest star Jesse Tyler Ferguson explains the word "fragile." In Abby's Flying Fairy School, the friends take the "Cinderella Challenge," and in Bert and Ernie's Great Adventures, Ernie, Bert, and Rubber Duckie are "The Three Duckateers." Murray flies a kite, and in Elmo's World, the "sky" is the limit!

Telly's upset to have missed Leela's yoga class, so Rosita and Elmo offer to teach him what they learned. There's just one problem: Can Telly find his balance point? Ohhmm. Plus, Emma Stone visits to introduce the word of the day. Bruno Mars also makes an appearance. There's a genie in a bottle in Abby's Flying Fairy School, and in Super Grover 2.0, Grover uses his powers of observation. More: Murray experiments with a boat, and Elmo explains the difference between "up" and "down" in Elmo's World.

There's some serious work to be done at 123 Sesame Street, but Gordon stubbornly insists he doesn't need any help. When things keep breaking, Susan, Chris, and The Count suggest that Gordon hire a super-but do they mean a superintendent or a Super Grover? Watch to find out! Special guest Nicole Kidman explains what "stubborn" means. There's some magical fun brewing in Abby's Flying Fairy School. Plus, Murray experiments with tools, and Elmo demonstrates the words "open" and "close" in Elmo's World.

123 Sesame has sprung a leak. While Susan runs to tell Maria and Luis about the flood, Ernie and Bert's beds become sailboats. Help, Gordon, help! Special guest star John Krasinski floats by to explain the word "soggy." Plus, in Abby's Flying Fairy School, the pals meet Morty the Musical Muse, and there's more fun with Super Grover 2.0. Finally, Murray experiments with a Rube Goldberg contraption, and step to it, because Elmo's World is all about feet.

Whoosh! It's a windy autumn day and Stinky is under a pile of leaves. Chris, Elmo, and Rosita dig him out, then Rosita begins to problem-solve, trying to figure out which tree the leaves are from. The friends become leaf detectives, comparing a leaf from the pile with leaves on surrounding trees. Will they find a match? Special guest star Ken Jeong explains the word "deciduous." Plus, in Bert and Ernie's Great Adventures, there's a frog race, and in Abby's Flying Fairy School, it's opposite day! Finally, Murray experiments with twirlers, and it's time to learn about the weather in Elmo's World.

Telly, Elmo, and Rosita are having fun helping their friends out by using all of their five senses. When Leela loses a glove, they use their eyes to find it. They spot a very miserable Oscar whose nose is so stuffed, he can't tell whether his milk is sour - enter the Excellent Nose Club! What else will they discover using all of their five senses? Also, Maria Menounos explains what the 'senses' are, Cookie Monster sings about sandwiches, there's more fairy fun over at Abby's Flying Fairy School, and Elmo's world is all about the epidermis!

Nighty-night! Big Bird is excited to sleep in his new pajamas but when Gordon tucks him in, he can't seem to get comfortable. There's something bothering Big Bird but he can't put his wing on it. This is a problem that only a sleep consultant can solve. As luck would have it, the Princess from the Princess and the Pea arrives to help diagnose the issue. Joel McHale meets with some "prickly" characters, in Abby's Flying Fairy School it's nap time, and in Elmo's World it's time to catch some z's.