Ep 16. Excaliferb!

Phineas and Ferb season 3 episode 16 is titled "Excaliferb!" This episode follows the familiar characters of Phineas, Ferb, Candace, and several others as they journey into an alternate dimension where the medieval era still reigns.

Upon arriving in this new world, the gang encounters their alternate selves - counterparts from this medieval world. Phineas and Ferb's counterparts are knights who are in search of the legendary Excaliferb - a sword that they believe holds the power to overthrow the land's wicked sorcerer. Meanwhile, Candace's counterpart is the queen of the land, and Doofenshmirtz's alternate self is a jester who works for the sorcerer.

As the group continues to navigate their way through this new world, they must come up with a plan to locate Excaliferb and help the knights overthrow the evil sorcerer. Along the way, they encounter obstacles such as giant animals, an enchanted maze, and even a fire-breathing dragon.

Throughout the episode, there are multiple plotlines running simultaneously. One involves Doofenshmirtz's alternate self attempting to impress the sorcerer with his humor, while another centers around Candace's attempts to impress her alternate self with her modern-day knowledge and fashion sense. Meanwhile, Phineas and Ferb work tirelessly to locate Excaliferb with the help of their alternate knight selves.

Overall, "Excaliferb!" is an exciting adventure full of action, humor, and even a bit of romance. With its clever blend of medieval and modern themes, this episode is sure to keep viewers engaged from start to finish.