Perry is the docile pet platypus of the blended Flynn-Fletcher family, who adopted him because his unfocused gaze made it seem as if he were looking at both Phineas and Ferb at the same time, as shown in the 2011 movie, Phineas and Ferb the Movie: Across the 2nd Dimension.
Perry adalah platipus hewan peliharaan yang patuh kepada keluarga campuran Flynn-Fletcher, yang mengadopsinya karena tatapannya yang tidak fokus membuatnya tampak seolah-olah sedang melihat Phineas dan Ferb pada saat bersamaan, seperti yang ditunjukkan pada film 2011, Phineas and Ferb the Movie: Across the 2nd Dimension.