The second season of Phineas and Ferb premiered on Disney XD on February 19, 2009, and a sneak peek of the season aired on Toon Disney on January 23, 2009, with the episode "Tip of the Day". The five main characters include stepbrothers Phineas Flynn and Ferb Fletcher, their older sister Candace Flynn, secret agent Perry the Platypus (who is also Phineas and Ferb's pet), and the evil scientist Dr. Heinz Doofenshmirtz.
Recurring characters include across-the-street neighbor Isabella Garcia-Shapiro, the boys' mom Linda Flynn-Fletcher, the boys' dad Lawrence Fletcher, Perry's boss Major Monogram, Carl the Intern, Candace's crush Jeremy Johnson, Baljeet Tjinder, Buford Van Stomm, Candace's best friend Stacy Hirano, and many more.
During the spring of 2008, Phineas and Ferb became the No. 1 animated show for kids and tweens. Seeing the success, Disney decided to renew the series for its second season â which was planned for twenty-six episodes at the time, unveiling it at the upfront presentation to advertisers on April 9 of that year. Later on July 27, thirteen more episodes were added to the order bringing the season to its final total of thirty-nine episodes. Production began in the fall of 2008, during the broadcast of the show's first season.
On January 18, 2009, the episode, "Tip of the Day," was confirmed to air on Toon Disney on the 23rd of that month, as a preview of the second season for a weekend-long marathon. Later on February 2, it was announced that the season would officially premiere on Disney XD, starting on the 16th of that month.
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The episodes "Perry Lays an Egg and Gaming the System" on the Disney Channel achieved the most views by ages 6âÂÂ11 and 9âÂÂ14 of any channel in that night's time slot. This achievement propelled the series to the number one animated telecast that week for the target demographics. On June 7, 2009, Disney announced that the show had become the number one prime-time animated television show for the demographics 6âÂÂ11 and 9âÂÂ14.
The premiere of "Phineas and Ferb Christmas Vacation" garnered 2.62 million viewers during its debut on Disney XD, the most watched telecast in the channel's history (including Toon Disney) and the number three program of the night in all demographics. It received 5.2 million viewers for its debut on Disney Channel. It was the highest rated episode of the series to date.
The premiere of "" garnered 3.862 million viewers, was watched by 22% of kids 2âÂÂ11, 13% of teens 12âÂÂ17, 5% of households, and 3% of adults 18âÂÂ49, also being the #1 program on that night and it was 25th for the week in viewership. On Disney XD, the episode ranked in the channel's top 3 telecasts of the year in viewers with 1.32 million, and Boys 6âÂÂ11 with 365,000, with a 2.9 rating. The hour telecast on August 2, 2010, is currently the Emmy-winning animated series' No. 2 telecast of all time on Disney XD in Total Viewers, in kids 6âÂÂ14 with 677,000 and a 1.9 rating, Boys 6âÂÂ14 with 435,000 and a 2.3 rating, and kids 6âÂÂ11 with 542,000 and a 2.2 rating, Boys 6âÂÂ11 and Boys 9âÂÂ14 235,000 with a 1.9 rating, behind only December 2009's "Phineas and Ferb Christmas Vacation".