It's fall/autumn in the Big Blue House. Treelo asks Bear to come into the living room, where Ojo is standing completely still. She's pretending to be a tree and so Treelo and Bear join and pretend to be an entire forest. When the leaves start falling off for all, Treelo begs for them not to go and Bear realizes that Treelo doesn't understand why the leaves are falling off. As Bear begins hunting for Treelo, he comes across Tutter, who's pushing a pumpkin into his mousehole. Bear helps him to push the pumpkin and learns that fall is Tutter's favorite season because it's a time when everything changes. He's making pumpkin pie this year and he promises Bear a special something. In the Shadow segment, shadow tells the story of "Peter Peter Pumpkin Eater" and also gives Bear a tip to help find Treelo. He eventually finds Treelo with Pip and Pop, trying to glue leaves back onto trees. He explains to Treelo that the leaves fall off to make way for new leaves in the spring and Treelo realizes that nothing is wrong with the leaves after all.
Welcome to the Blue House • Goodbye Song • What's That Smell? • The Bear Cha-Cha-Cha • Dear Grandma • Happy, Happy Birthday • Good Morning • Brush Brush Bree • Look at You Now • That's My Name • Everybody Say Ah • Great to Be at Home • Go to Bed, Sleepy Head • Take Time to Smell the Cheese • Clean Up the House • Oops! I Goofed Again • Quiet Time • Otter Love • Shape of a Bear • Baby, Baby • When You Make Yourself a Friend • Oh, Boy • You Go, Ojo • Need a Little Help Today • What's in the Mail Today? • Making Sense of the World • The Grandma Mambo • Remember When • The Otter Dancing School • Shadow's Lullaby • When I'm Older • Everybody in the Tub • Rhythm in the Air • Why Can't the Dirt Just Leave Me Alone? • Imagine That • Smellorama • When I Find the Great Lost Cheese • Under Your Blanket • Love is Incredible • Your Grandma and Grandpa • What Kind of Mouse Am I? • Picture This • Hello Doctor • Worth the Wait • Friends Forever • Surprise! • What's Mine is Yours • The Toileteers • Next Stop, Dreamland