season number: 4
number of episodes: 48
release date: 2012-12-07
IMDb: tt3067144
overview
Season 4 started with "For Your Ice Only", a winter-themed sports episode and "Happy New Year!", a celebration of New Years Day.
Other episodes include "Sidetracked" and "Primal Perry" (both as a commemoration of Platypus Day), an episode that succeeds the events of Phineas and Ferb the Movie: Across the 2nd Dimension, along with some crossover episodes featuring in the Marvel Universe and in the Star Wars Universe, a Valentine's Day themed special set ten years in the future, and finally the end of Phineas and Ferb's summer.