|US||2007||15||Comedy . Animation . Family . Sci-Fi & Fantasy|
Phineas and Ferb find themselves in the Stone Age as cavemen and try to invent the wheel; the guys visit ancient China, where they try to rescue a princess who was taken prisoner by Doofus Khan.
|Episode Title:||Tri-Stone Area|
|Airs:||2012-01-13 at 08:30 pm|