Agent B was shown in "Cheer Up Candace", attempting to arrest Perry. It also appeared in the flashback in Phineas and Ferb the Movie: Across the 2nd Dimension.
- According to its secret file, it has "brains and brawn in a single wrinkly package." Its bite is indeed worse than its bark. (Where's My Perry?)
- "Cheer Up Candace" (First appearance)
- Phineas and Ferb the Movie: Across the 2nd Dimension
- "Backyard Hodge Podge"
- "Phineas and Ferb Save Summer"
- "O.W.C.A. Files"
- Where's My Perry? (Agent File)