
Cheery Spherey Day / Diary Daze / Rock-a-bye Billie
The Polies invite the Bevels over to celebrate a holiday that reminds them that all shapes are important; Olie has to write down his weekend activities in a diary for a school project, however when he spends all his time thinking up fun activities to put into his diary, he misses out on the real weekend fun; It's the annual Polie/Bevel talent show but Billy can't think of any talents that he has. Olie, however, overhears Billy singing a lullaby to Binky, and points out something Billy has been taking for granted, that he can sing Binky to sleep.
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More from this season

S4 E1
Family Portrait / Show and Tell / Little Helping Hand
Polina wants the family to wear blue for picture day; Olie looks for something to bring to show and tell; Percy helps Big Gene and Little Gene repair their spaceship.

S4 E2
Pretend Friend / Beddy Day for Daddy / Chunk Squarey
Zowie has fun with an imaginary friend who may not be so pretend after all.; Percy Polie comes down with a cold, and Mrs. Polie recruits Zowie to make sure that her husband stays in bed until he recovers.; Polieville is caught up in ""The Twirl"", a sing 'n' dance sensation pioneered by Chunk Squarey, who is, like Billy, from Cuby.

S4 E3
We Scream for Ice Cream / Pomps Up / Anchor Away
The kids go to a planet made of ice cream; The boys help make Gizmo's pomp stand upright when it somehow flops in front of Gizmo's face; Olie's parents remember the day they first met.

S4 E4
Guys and Dollies / Dinglie Danglie Doodle / Dancin' Machines
Olie finds out why girls play with dolls; Zowie learns a bad word and must find a way to stop saying it all the time; Some of the machines begin to dance.