In Napalms over Danville, Phineas and Ferb, inspired by a World War 2 documentary, decide to relive World War 2. Things go awry when a Napalm Bomb falls on Danville, courtesy of Dr. Doofenshmirtz's revenge on Danville. It is up to The Agency to save Danville from misery.
- Major Monogram
- Carl Karl
- Dr. Doofenshmirtz
- Roger Doofenshmirtz
- SS SN
Phineas, Ferb, and Lawrence watch a 2-hr documentary on World War 2. When it ended, Phineas had an idea of "what they're gonna do today". However, Linda informs the boys that Vivian invited the boys over for a pool party with Isabella. Buford and Baljeet are also invited too.
Perry is shown in the backyard, jumping into Phineas' neighbor's kiddie pool. Upon reaching the lair, Perry puts on his fedora. Major Monogram briefs him with an urgent mission: Stop Doofenshmirtz from ruining his brother's social event, which is held by the Danville Chamber of Commerce.
Upon reaching D.E.I., Doof traps Perry in a giant grenade bomb. Doofenshmirtz tells him that his goody-goody brother is at the beach hosting a social event, which is Danville's 41st Lobster Fest. Heinz plans on dropping his napalm bomb in the ocean, so the water can ruin Roger's social event. However, Perry (behind Heinz's back) edits the plan and the napalm hits Danville.
At the pool party, Isabella notices that the sky is getting foggy. As her friends get inside the house, due to the weather, Vivian tells the kids to evacuate her house. However, Baljeet's nightmare begins here, as the napalm melts off his bathing suit, leaving him naked. The kids run down the road to Maple Drive, since they don't want to be "sunbaked".
When Candace was talking to Stacy on her phone, she smelt some smoke. She swore that it isn't popcorn. It turned out to be napalm! Candace got as angry as she can, and yelled at mom on what (she assumed) Phineas and Ferb did. Linda denies it, saying that they're at Vivian's for a pool party.
Candace, feeling disbelief, takes mom to the frontyard to actually see the napalm. Linda is shocked, thinking that Phineas and Ferb would never make that kind of bomb. However, Major Monogram tells her that Doofenshmirtz was the one that built the napalm, while the other OWCA agents are telling the neighbors to evacuate from the Napalm attack.
After Monogram and Linda talk, the SS SN come and arrest Doofenshmirtz for destroying Danville. He yells "Curse you, Perry the Platypus! How could you do THIS to me?! I thought we were good friends! I also hate you Perry the Platypus!". As the kids run back to Linda's house, Buford and Isabella clamor to Monogram that "they took Baljeet's clothes".
The OWCA agents help Baljeet by giving him water to drink, as well as covering his sunburn with Aloe Vera. Vivian cries for help, while she carries Pinky. Linda takes Candace inside telling her that "you have seen enough war movies. Go upstairs and read a book, or interact with your friends." Phineas notices Perry's return.
- The original title, All This and World War III, is a reference to the film All This and World War II.
- The way Baljeet runs from the falling napalm, is similar to the Napalm Girl from 1972.