The best episode written by Mike Roth is "Phineas and Ferb: Summer Belongs to You!", rated 10/10 from 1 user votes. It was "directed by Dan Povenmire". "Phineas and Ferb: Summer Belongs to You!" aired on 8/2/2010 and is rated 0.8 point(s) higher than their second highest rated, "Rage Against the TV".
It's the summer solstice, so Phineas, Ferb, and their friends decide to travel around the world in one day in an effort to create the "biggest, longest, funnest summer day of all time". But not everyone believes they can actually achieve what they have set out to do, especially Buford. Candace tags along because Jeremy is on a trip to Paris, and she fears that there he may meet other girls. Also, Isabella finds her affections for Phineas sorely tested when his steadfast focus on achieving his goal puts pressure on her. Meanwhile, Dr. Doofenshmirtz takes a father trip to Tokyo, Japan with Vanessa, but sets out with Perry and Major Monogram to find her when she joins Phineas, Ferb and the others.
Director: Dan Povenmire
Writer: Mike Roth
The guys fight for their jobs after Benson replaces them with an ostrich and a possum.
Director: John Infantino
Writer: Mike Roth
Phineas and Ferb decide to do absolutely nothing for the day. Candace questions her purpose in life after realizing that she can't bust her brothers for doing nothing. Meanwhile, Dr. Doofenshmirtz is tired of being the ugliest person around, so he invents a device that can turn anything and anyone ugly.
Director: Zac Moncrief
Writer: Mike Roth
While visiting their grandparents, the kids decide to create and race a giant hot air balloon. Meanwhile, Candace is inspired by train engineer Glenda's can-do attitude and decides to "give up" on busting her brothers. On the other side of town, Dr. Doofenshmirtz finds a Dodo bird egg and is convinced that it is a fierce bird-monster that can help him take over the Tri-state area, but discovers the exact opposite when the egg hatches.
Director: Robert Hughes
Writer: Mike Roth
Phineas and Ferb have a new pet, Goldy the goldfish, and to help make Goldy feel less lonely, Phineas and Ferb have built an aquarium with many other creatures. Meanwhile, Perry must stop Doofenshmirtz from a food related childhood revenge story.
Director: Robert Hughes
Writer: Mike Roth
When Phineas and Ferb get inspired by Candace's dessert club to create the biggest piece of gelatin ever, even Jenny and Stacy want to join in. Meanwhile, Doofenshmirtz has a horrific plan, to turn Perry evil!
Director: Zac Moncrief
Writer: Mike Roth