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Geo Umizoomi is Milli's only brother, and also the other primary protagonist of the Team Umizoomi, series voiced by Ethan Kempner from Seasons one through three, and by Juan Hirt for season four.


Geo has blue hair. He usually wears a blue shirt, blue trousers, blue and orange roller skates, and a blue helmet topped off with two tiny antennae. He wears an orange square belt known as the Shape Belt with a triangle, square and circle (in his belt order) on each side of the belt. His dimple smile is hard to miss.


Geo appears in every episode of Team Umizoomi. His first appearance was in The Big Boat Race, and his last appearance was in Umi Rescue Copter.


  • Super Shapes: The main power of Geo. It often consists building various objects and/or tools out of shapes.
  • Shape Splitter: A sword that could split any shapes in half to build the item. This power was introduced in "DoorMouse in Space", and was also used in "The Kitty Rescue" and "Animal School House."
  • Shape Magnet: A power introduced in the Season Three episode "Rainy Day Rescue". Also used in other episodes such as "The Umi City Treasure Hunt" and "City of Lost Penguins". Geo holds a magnet which can attach to or attract any kind of shape.
  • Antennae: The antennae on Geo's helmet are not just for decoration. He uses them to make blue prints. He slightly tilts his head to the right and the antennaes make blue prints to look like whatever he wants it to look like. In Team Umizoomi VS. The Shape Bandit, he made blue prints that were made up of objects he found around the area. In "Movie Madness!", while in the spy movie, he used the sunglasses he was wearing to make a blue print of a shark submarine.



Geo tends to shows his feelings more than the other members of the team, and he's also a bit sensitive. Aside from that, he has a very sparky personality and a "GO! GO! GO!" approach to life. Since he has so much ambition in him, Geo never gives up until the end and always tries his best. He also has a bit of a prankster side revealed in "Doctor Bot" when he hid a toy chicken on himself to trick Bot when he was checking his heartbeat. He is also the fastest member of the team.

Personal Life

You can never find Geo not wearing his Roller Skates. He skates everywhere he goes. In The Aquarium Fix-It, he is revealed to have a pet sea horse named Finn. In Cuckoo Bears, it is revealed that Geo has some experience in playing the bass. His favourite food is pepperoni pizza.


All we know is is that Geo was born a year after Milli. According to Nathan Simpson (Geo’s Going Live UK voice actor) he did invent the Shape Belt.


  • Geo's name is a prefix meaning Earth. It's also related to Geometry, which refers to shapes.
  • In "Team Umizoomi VS. The Shape Bandit" even without his shape belt, he still has his powers and make anything with shapes found in his surrounding.
  • In "Milli Saves The Day", Geo is the third member of Team Umizoomi to be in trouble. The first member to be in trouble was UmiCar in The Great UmiCar Rescue. The second member to be in trouble was Bot in Crazy Skates.
  • Geo has been known to express his emotions more than the other members of Team Umizoomi. He has an excited scream, an angry face, and his ambitious face.
  • In certain episodes, Geo shows negative feelings against DoorMouse. We currently don't know why this .
  • Joanna Ruiz (aka Geo's UK Voice Actor) was also the voice of Pixel and Trixie on another Nick Jr. show, ''LazyTown''.


  • "Awesome!"
  • "Umi-zoomi!"
  • "Super Shapes!" (his catchphrase)
  • "Hold onto your helmets!"
  • "Who-hoo-hoo!"
  • "We got you, buddy!" (often directly to Bot)
  • "Sea-horse power!" (from "The Aquarium Fix-It")
  • "We're free!" (from Movie Madness! and Umi Ninjas)
  • "Calling UmiCar, Calling UmiCar!"
  • "Come and get us!"


(See Geo/Gallery)