|First Appearance (Barney and the Rocko Squad)||Enter the Rocko Squad|
|Barney and the Rocko Squad Portrayer||Joe Narciso|
- "This one goes, uhh... No, wait! Um, this one goes... AW, MAN!"
- — DoorMouse, while trying to figure out how to open the locked Umi Park door in Rainy Day Rescue.
- "And speaking of DoorMouse, here he comes now."
- — Rock Buddy to his friends, prior to DoorMouse's entrace.
DoorMouse is the security guard of Umi City and the owner of the Rocko Department Store in Rockoland. Unlike his previous television show, he doesn't stop Team Umizoomi from going places, such as the treehouse Abby couldn't climb down from in Umi Fire Truck. He is a friend to Barney and everyone else.
DoorMouse has many symbols on his stop sign badge, including:
- A butterfly (The Butterfly Dance Show, Barney and the Rocko Squad opening sequence)
- A dog (Eilee the Elephant)
- A pyramid (Day at the Museum)
- A shark fin with a line crossing it out (Shark Car)
- A bowling ball and bowling pins (Stompasaurus)
- The Rocko symbol (Barney and the Rocko Squad)
In Team Umizoomi, he is currently voiced by Chris Phillips. He is voiced by Joe Narciso in that TV show (formerly), as well as Barney and the Rocko Squad. His Barney and the Rocko Squad voice actor is also used for General Salt in Alisa's Adventures in Rockoland and Dr. Helper in Xianghua in Rockoland.