Ep 11. Mom's Birthday / Journey to the Center of Candace

Phineas and Ferb is an animated television series that aired from 2007 to 2015. The show follows the adventures of two stepbrothers, Phineas Flynn and Ferb Fletcher, as they create elaborate inventions and embark on exciting adventures during their summer vacation.

Season 1, Episode 11 is titled "Mom's Birthday / Journey to the Center of Candace." The episode features two separate storylines that take place simultaneously. In "Mom's Birthday," Phineas and Ferb plan a surprise birthday party for their mother, Linda Flynn-Fletcher, with the help of their friends. Meanwhile, in "Journey to the Center of Candace," Candace Flynn, Phineas and Ferb's older sister, discovers that she has swallowed a miniature camera and embarks on an adventure inside of her own body to retrieve it.

In "Mom's Birthday," Phineas and Ferb decide to create the ultimate birthday surprise for their mother. Utilizing their engineering skills, the boys construct an enormous cake made out of ice cream and a giant treadmill that will power a fireworks display. Meanwhile, their friends help by creating decorations and organizing the other party guests.

As the preparations for the party are underway, Candace realizes that she has accidentally swallowed a miniature camera that was meant for a spy mission she was conducting against her brothers. Unable to retrieve the camera on her own, Candace enlists the help of her brothers in order to shrink themselves down to microscopic size and enter her body to retrieve the camera.

In "Journey to the Center of Candace," the boys create a device that will shrink themselves down to miniature size and allow them to enter Candace's body. They journey through her bloodstream in a miniature submarine and encounter various obstacles throughout her body, including her immune system, white blood cells, and stomach acid.

Meanwhile, back at the party, Linda is starting to worry about where Phineas and Ferb have disappeared to. She goes out to search for them but is soon caught up in the surprise party they have planned for her.

Eventually, Phineas and Ferb are able to retrieve the camera from Candace's stomach and return it to her. The boys then return to their normal size and the party for Linda continues, complete with the treadmill-powered fireworks display.

Overall, "Mom's Birthday / Journey to the Center of Candace" is a fun and imaginative episode that showcases the creativity and problem-solving skills of the show's main characters. The two separate storylines are woven together seamlessly, providing a cohesive and entertaining viewing experience for both children and adults.