Snapped: Killer Couples (2013)

S3E28 Tri-Stone Area

Title: Tri-Stone Zone Plot: Set in the Stone Age, Phineas and Ferb take on the challenge of creating an innovative and entertaining invention: the wheel! At the same time, Dr. Doofenshmirtz is on a mission to enhance his cave’s style, opting to use a simple stick as a prototype for his latest scheme, a primitive version of his notorious Inator gadgets.