S3E1 · La Biosphère

Vincent Martella

Phineas Flynn (voice)

Thomas Brodie-Sangster

Ferb Fletcher (voice)

Ashley French

Candace Flynn (voice)

Caroline Rhea

Linda Flynn-Fletcher (voice)

Dee Bradley Baker

Perry the Platypus (voice)

Alyson Stoner

Isabella Garcia-Shapiro (voice)

Bobby Gaylor

Buford Van Stomm (voice)

Dan Povenmire

Heinz Doofenshmirtz (voice)

Jeff 'Swampy' Marsh

Francis Monogram (voice)

Maulik Pancholy

Baljeet Tjinder (voice)

Richard O'Brien

Lawrence Fletcher (voice)

Kelly Hu

Stacy Hirano (voice)