Abby Cadabby moves to Sesame Street: There's a new Muppet on the block! It is Abby's first day on the street. Can everyone's favorite fairy-in-training overcome her shyness and make new friends? Also in this episode: Law & Order: Special Letters Unit and a performance by John Legend with Hoots the Owl. Special guest Kristin Chenoweth stops by Elmo's World. This episode is brought to you by the letter M and the number 4.

Elmo and the Seven Dwarves: Snow White (Amy Sedaris) visits Sesame Street with her dwarves. One by one, each dwarf leaves the group, and soon Snow White ends up with ZERO dwarves. Can Elmo save the day for Snow White? Also in this episode: Bert and Ernie sing about circles and Grover learns how to ride a bike. This episode is brought to you by the letter O and the number 7.

Elmo and Zoe's scientific exploration: Will Rocco the Rock float? Will a leaf sink? Elmo, Zoe, Telly, and Gordon have fun along the way as they perform simple experiments to find the answers. Also in this episode: Global Grover returns from Nicaragua to explain how bricks are made, and an observant gardener lends a hand to some "Desperate Houseplants." This episode is brought to you by the letter P and the number 15.