Unnamed mouse agent is a small-sized agent who had appeared in some episodes. In its first appearance, it's seen riding the elevator along Agent B, Agent C, and others ("Isabella and the Temple of Sap"). It appeared again in "Phineas and Ferb Christmas Vacation!" dancing with the other agents. Its next appearance wouldn't be until Phineas and Ferb the Movie: Across the 2nd Dimension, where it's seen attacking Norm Bots along its fellow agents. It had abs and bulky arm muscles. ("Phineas and Ferb Save Summer ")
Its appearance is that of an ordinary mouse with a fedora.
Its boss in the O.W.C.A..
It can team with the other Agents well as it's seen in Across the 2nd Dimension. It is on good terms with Perry, and others, even its real predators, so it is assumed it does have friends in the Agency.
- "Isabella and the Temple of Sap" (First appearance)
- "Phineas and Ferb Christmas Vacation!" (Cameo)
- "Phineas and Ferb the Movie: Across the 2nd Dimension"
- "Agent Doof"
- "Phineas and Ferb Save Summer"
- "O.W.C.A. Files"