Tri-Stone Area

is a future episode of Phineas and Ferb.

Summary
The Tri-State Area is changed into the prehistoric Tri-Stone Area, and all the characters become cavemen and cavewomen. Nothing more is known at this time, but the episode first surfaced Dan Povenmire's YouTube account. There will be a caveman version of Gitchee Gitchee Goo, called Zabadaba.