Agent L first appeared in "Cheer Up Candace".
- According to its agent brief, it is clever and stealthy, its regenerative limbs make it well suited for danger, requires ample sunlight or it gets sluggish, and enjoys sampling exotic cuisine. (Where's My Perry?)
- "Cheer Up Candace" (First appearance)
- "Phineas and Ferb Christmas Vacation!"
- "Rollercoaster: The Musical!" (Cameo)
- Phineas and Ferb the Movie: Across the 2nd Dimension (Cameo)
- "Backyard Hodge Podge"
- "Phineas and Ferb Save Summer"
- "O.W.C.A. Files"
- Where's My Perry? (Agent File)