Phineas and Ferb: Back 2 School is one of the many sequels to Phineas and Ferb. The Pilot was filmed on the 18th August 2013 and was picked up for a series on the 20th August 2013. On the 6th November, Disney Channel Cancelled Phineas and Ferb: Back 2 School after 1 season, yet aired the remaining 10 episodes. 2 days after, they reconsidered the cancellation and picked it up for a 2nd season.