Season
Season 5 Episode
- Season 4 For Your Ice Only
- Season 4 Happy New Year!
- Season 4 Fly on the Wall
- Season 4 Bully Bust
- Season 4 My Sweet Ride
- Season 4 Der Kinderlumper
- Season 4 Sidetracked
- Season 4 Primal Perry
- Season 4 Mind Share
- Season 4 Backyard Hodge Podge
- Season 4 Bee Day
- Season 4 Bee Story
- Season 4 Great Balls of Water
- Season 4 Where's Pinky?
- Season 4 Phineas and Ferb's Musical Cliptastic Countdown Hosted by Kelly Osbourne
- Season 4 Knot My Problem
- Season 4 Just Desserts
- Season 4 La Candace-Cabra
- Season 4 Happy Birthday, Isabella
- Season 4 Love at First Byte
- Season 4 One Good Turn
- Season 4 Phineas and Ferb: Mission Marvel
- Season 4 Thanks But No Thanks
- Season 4 Troy Story
- Season 4 Druselsteinoween
- Season 4 Terrifying Tri-State Trilogy of Terror
- Season 4 Face Your Fear
- Season 4 Cheers for Fears
- Season 4 Steampunx
- Season 4 Just Our Luck
- Season 4 Return Policy
- Season 4 Live and Let Drive
- Season 4 Phineas and Ferb Save Summer
- Season 4 Father's Day
- Season 4 Imperfect Storm
- Season 4 The Return of the Rogue Rabbit
- Season 4 It's No Picnic
- Season 4 The Klimpaloon Ultimatum
- Season 4 Operation Crumb Cake
- Season 4 Mandace
- Season 4 Phineas and Ferb: Star Wars
- Season 4 Lost in Danville
- Season 4 The Inator Method
- Season 4 Night of the Living Pharmacists
- Season 4 Tales from the Resistance: Back to the 2nd Dimension
- Season 4 Doof 101
- Season 4 Act Your Age
- Season 4 Last Day of Summer
Phineas and Ferb - Season 4 Episode 19 Happy Birthday, Isabella
7.89 48 minutes Phineas and the gang celebrate Isabella's birthday in a big way, but all she really wants is some quiet time with Phineas. Meanwhile, Doofenshmirtz has installed his Bugs Me-Inator onto an evil bug bus and is driving around Danville turning all the things that bug him literally into bugs.
