Phineas hears that Ferb made Isabella fall in love with him! Can Phineas, his loyal sister, Candace and his good friend, Nikki save the day? Meanwhile, Doofenshmirtz moves to China, so Perry's mission is to travel there.
Kissin U by Isabella
Busted by Phineas, Candace and Nikki
Gitchee Gitchee Goo by Ferb and Isabella
About You Now by Candace thumb|300px|right|About You Now (I know it was sung before Miranda Cosgrove)
The "Too Young" Line
(gasps when Candace finishes "About You Now" and gets Phineas and Isabella back together)
Isabella to Ferb
Doofenshmirtz is traveling to China!
- Nikki's hair is brown when she, Phineas and Candace look at Ferb and Isabella from behind a bush.
- When Candace sings "Busted" in this episode while she, Phineas and Nikki were spying on Ferb and Isabella, Vanessa was not there singing with her. Instead, Phineas and Nikki are.
- This episode proves Nikki is a good singer.
Phineas and Isabella kiss when Candace finishes "About You Now." ("Phineas and Isabella's Romance")
Nikki makes her second appearance. Her first is Phineas's Love Life.
- Isabella sings "Kissin U" by Miranda Cosgrove when she and Ferb are hanging out.
- Candace also sings "About You Now" by Sugababe (and later Miranda Cosgrove) so she could get Phineas and Isabella back together.
Vincent Martella as Phineas
Thomas Sangster as Ferb
Alyson Stoner as Isabella
Ashley Tisdale as Candace
Grey DeLisle as Nikki
Jeff "Swampy" Marsh as Major Monogram
Dan Povernmire as Doofenshmirtz
Dee Bradley Baker as Perry