Phineas and Ferb

Phineas and Ferb was a Disney Channel and Disney XD animated television series that centered on two stepbrothers, their sister, their platypus, and their adventures during summer vacation. The series premiered worldwide on February 1, 2008. It is also the first DCOS to premiere simultaneously worldwide. The show's official US premiere was marketed as Phineas and Ferb-uary, due to new episodes being shown on many of the days during the month of February. Many of the show's voice actors also appear on other Disney Channel shows; such as Hannah Montana and The Suite Life of Zack and Cody. According to the theme song, since there's 104 days of summer vacation, it was considered that the series will consist of 104 11-min episodes or 52 22-min episodes. On August 25, 2011, the show was picked up for a fourth and final season on Disney Channel, later known to be 37 episodes, a possible spin-off on Isabella and the Fireside Girls and a feature film for the series. The series also had a live show that was shown in over 80 different cities across the United States. On June 9, 2014, Phineas and Ferb broke the all-time record of half-hour episodes, set by Dumbo's Circus with 120. It is the longest running Disney Channel Original animated Series, beating Kim Possible's 5 years and 3 months.

On July 25th, 2014, Dan and Swampy announced that there are 20 unaired episodes of Season 4 left that haven't aired yet. Afterward, they will take their first hiatus in 8 years.

The series ended after the hiatus in favor for the new spin-off series Milo Murphy's Law, which first aired in 2016 on Disney XD, which takes place in the same universe as Phineas and Ferb. The series' run ended on June 12, 2015 with its series finale special episode, as well as a standalone hour-long episode airing on November 9, 2015, on Disney XD and on January 15, 2016, on Disney Channel.