Herman the Hedgehog is an agent, codenamed Agent H.
- He's the first minor agent to be named. (Pinky doesn't count because he was named before being known as an agent).
- He appears in the "Spot the Diff" Marathon, falling on Candace's head in the change-inated episode, "Lawn Gnome Beach Party of Error!".
- His theme song is the same melody as Agent P's.
- According to his secret file in "Where's My Perry?", he fits into small spaces easily, often goes unnoticed (especially when disguised as a coconut), is the perfect size and shape to toss like a football, and wide eyes which never seem to blink.
- "Bowl-R-Ama Drama" (Cameo)
- "Lawn Gnome Beach Party of Error!" (Spot the Diff Marathon Episode)(Cameo)
- "Phineas and Ferb Christmas Vacation!"
- "Rollercoaster: The Musical!"(Cameo)
- "Phineas and Ferb Save Summer"
- Where's My Perry? (Agent File)