|Air date||April 20, 1989|
|Season||Season 20 (1988-1989)|
|Sponsors||T, U, 4|
- The gang watches the hatching of a baby duck and sing "Someone's Here With Us Who Wasn't Here Before."
- Film: Hands build things out of triangles and squares while off-screen voices try to figure out what the constructions will be. (First: Episode 0004)
- Ernie and Bert: Ernie sings "Happy Birthday" to a letter U, which blows out the candle on the cake. (EKA: Episode 1517)
- Cartoon: "Stones Don't Grow"
- Cartoon: A U train spells the words Unite, U-turn, Underground, Up, and Universe. (EKA: Episode 0810)
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|Episode 2598||Episode 2600|