of its lead-in, High School Musical 2. When Phineas and Ferb officially debuted in February the next year, it proved to be cable's number-one watched animated series premiere by tweens. Throughout the quarter that followed, it peaked as the top-rated animated series for ages 6–10 and 9–14, also becoming the number-three animated series on cable television for viewers age 6–10. By the time the second season was announced in May 2008, the series had become a top-rated program in the 6–11 and 9–14 age groups. The Disney Channel airing of "Phineas and Ferb Get Busted!" was watched by 3.7 million viewers. The episodes "Perry Lays an Egg" and "Gaming the System" achieved the most views by ages 6–11 and 9–14 of any channel in that night's time slot. This achievement made the series the number-one animated telecast that week for its target demographics. On June 7, 2009, Disney announced that the show had become the number-one primetime animated show for the 6–10 and 9–14 groups. The premiere of "Phineas and Ferb's 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 across all demographics. It received 5.2 million viewers for its debut on Disney Channel and was the highest-rated episode of the series to date and fifth-highest for the week. The premiere of "Phineas and Ferb: Summer Belongs To You!" garnered 3.862 million viewers and was watched by 22% of children 2–11, 13% of teens, 5% of households and 3% of adults 18–49, also ranking as the number-one program for that night and as 25th for the week. On Disney XD, the episode ranked among the channel's top three telecasts of the year with 1.32 million viewers, including 365,000 among boys 6–11, with a 2.9 rating. The hour-long telecast on August 2, 2010, was the series' number-two telecast of all time on Disney XD in total viewers, behind only December 2009's "Phineas and Ferb's Christmas Vacation." Marketing and merchandise Disney has licensed a number of products from the show, including plush toys of characters Perry, Ferb, Phineas and Candace. Disney released several T-shirts for the show and launched a "Make your own T-shirt" program on its website. Authors have novelized several episodes. Two Season 1 DVDs, entitled The Fast and the Phineas and The Daze of Summer, have been released;