Phineas and Ferb: 104 Days of Summer! Season 1 Episode 14 Mom's Birthday Episode / Journey to the Center of Candace

In the fourteenth episode of the hit animated television series, Phineas and Ferb, titled "Mom's Birthday Episode / Journey to the Center of Candace," the titular brothers set out to throw their mother, Linda Flynn-Fletcher, the best birthday party she has ever had while simultaneously embarking on a wild scientific adventure. As usual, the boys aim to construct something impressive and this time, they decide to build a machine that will travel to the center of the Earth!

Meanwhile, their older sister Candace, who is always desperate to bust her brothers for their wild summer activities, has some trouble of her own. She had failed an exam and was in danger of being excluded from a school trip. After some initial panic, she devises a plan to try and impress her teacher, Mr. Untouchable, by presenting him with a stunning rock found in the backyard.

As Candace tries to secure her place on the trip, Phineas and Ferb get to work constructing their invention. They decide to make use of the sheer number of tunnels and holes already dug around their backyard to fit their machine underground. The all-terrain vehicle they build will allow them to travel across different layers of the Earth. They're eager to embark on an exciting journey that will allow them to discover the center of the Earth and fulfill their mother's birthday wish of finding something she lost there as a child.

From riding on lava flows to meeting prehistoric beings, the boys encounter numerous challenges and exciting adventures in their journey. Along the way, they discover an advanced civilization living within the Earth's core and saves them from imminent danger. They also manage to retrieve the item their mother had lost as a child, which adds a special touch to the birthday party they throw for her.

While Phineas and Ferb's epic adventure leads them to forgotten corners of the Earth, much closer at hand, Candace must navigate her own potential disaster. When she accidentally locks her brothers' friend, Baljeet, in the space where she was to meet Mr. Untouchable, she must think quickly to salvage the situation. Later, after managing to free Baljeet and deliver the rock, Candace earns the respect and admiration of her teacher.

In the end, a joyful celebration takes place where Linda finally gets her cake and the whole family partakes in the fun-filled birthday party. The episode is a great balance of Phineas and Ferb's incredible imaginations, exciting adventures, and Candace's desire to do well in school. Viewers are sure to have an exciting and enjoyable time experiencing this episode of the animated series and following the characters as they navigate their summertime adventures.