Major Monogram is home sick, so Carl decides to visit and tell him the story of Excaliferb from a book.
Thus comes the tale of how Phineas and Ferb go on a quest to defeat Malifishmertz.
- All for Nothing: The quest for the sword Excaliferb is ultimately pointless, as it ends up breaking before it can be used and contributes nothing to resolve the conflict.
- All There in the Script: Linda's counterpart in this story is named "Linderella", which is only mentioned in the closing credits.
- Anti-Climax: How the final battle with Malifishmertz ends. Monogram is in disbelief that it actually happens that way.
- The Cavalry: Subverted. Carl tries to have his self-insert appear in the story to save everybody, but Monogram forces him to tell the tale as it's written.
- Chekhov's Gun: The transformation potions Phineas and Ferb were making at the beginning of the story.
- Cutting the Knot: Instead of answering the Bridge Troll's riddle to earn the right to cross her bridge, Phineas and Ferb's gang just walk through the shallow river that the bridge runs over.
- Didn't Think This Through: Malifishmertz tries to use a wicker cage to imprison Parable the Dragonpus. Obviously, Parable just burns his way out.
- Framing Device: The story of "Excaliferb", the main meat of the episode, is being told by Carl to a sick Major Monogram. The episode occasionally cuts back to the two for some jokes and commentary.
- Her Code Name Was "Mary Sue": Carl tries to insert himself into the story he's narrating so he can be the hero and save everyone. Major Monogram quickly puts a stop to it.
- Hero of Another Story: While Phineas and Ferb are talking to the Lady of the Puddle, King Arthur is receiving Excalibur from the Lady of the Lake.
- Ladyella: Linda's counterpart in the story is "Linderella".
- Plan B Resolution: With Excaliferb having fallen apart, the heroes must rely on Phineas and Ferb's shapeshifting potions.
- Rain of Something Unusual: The episode has the two boys' (in the story) Middle-Age adventures by noticing that the rain is fishy by it raining fish.
- Witch Hunt: When Candevere rants to herself about the orders Linderella gives her, one of them is to "accuse the neighbors of witchcraft".