U is the 21st letter in the Alphablock gang.
U is voiced by David Holt.
- U is a blue Alphablock wears a hat and glasses and shoes.
- U might run away from Q.
- U might say a lot of Un- words.
- Alphablocks (first appearance)
- Alphalympics (sound only)
- Van (sound only)
- Rainbow (sound only)
- Little Red N
- Frog on a Dog
- Thing (sound only)
- The End
- Plusman (sound only)
- Blue (last appearance)
- His “long vowel” episode is Blue.
- He has a one-sided relation ship with Q.
- U is often unlucky, as seen in episodes like Up.
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