Phineas and Ferb

Season 3, Episode 28

Episode Title: Tri-Stone Area

Air Date: 2012-01-13

Overview:

It’s the Stone Age and Phineas and Ferb are cavemen who decide to invent something new, fun and useful…the wheel! Meanwhile, Dr. Doofenshmirtz attempts to make his digs more upscale by using the precursor to the Inator device... a plain old stick.