Sir Dennis and The Dragon

Sir Dennis and the Dragon is the one hundred and eleventh episode from Season 1.

Plot
Jay, Margaret, and Gina are walking to school while Dennis is skateboarding when a whirlwind comes by, knocking Dennis off his skateboard. The whirlwind was actually a being. Gina believes it to be a monster while Margaret says it's an alien. Dennis recognizes the being as Professor Mentalapse. Dennis explains to Jay that Professor Mentalapse has a real time machine as they go to the collapsed Mentalapse.

Professor Mentalapse tells the kids to get to the roundtable. Gina tries to deny Mentalapse's request by saying she already ate, thinking he was talking about a "round table", to which Margaret corrects her by saying the "Roundtable", with King Arthur in the United Kingdom in 530 A.D. Professor Mentalapse continues to explain that he was cruising through the time of Camelot being attacked by a dragon.

Mentalapse believes King Arthur needed help, and the kids agree to go back to the year 528 and meet King Arthur. At that time, King Arthur is having a hard time deciding what to wear to meet her lady fair. This is when Professor Mentalapse's time machine crashes into the castle, just as Arthur decides on the armor. One of the knights orders Professor Mentalapse to get his time machine off the roundtable. This is where Gina jokes that the knight talketh funny by biteth off hith tongueth.

Professor Mentalapse introduces Arthur to Gina, Jay, Margaret, and Dennis and that they're from the 20th century. Arthur still couldn't decide on the chain mail or the armor. Dennis is puzzled by this when Margaret explains Arthur's in love with Lady Guinevere. Jay calls Guinevere a fox to which Arthur takes offense that Jay insulted Guinevere, only for Professor Mentalapse to translate what Jay said as "Beautiful maiden".

Just as Professor Mentalapse explains the reason he, Gina, Margaret, Dennis, and Jay arrived in this time was to fight a, only to be interrupted by a dragon terrorizing the village. One knight offers to slay the dragon, despite all the other knights being unable to prevail at doing so. The knight walks clumsily out to slay the giant monster. Dennis wants to see this, so he, Gina, Jay, and Margaret go out to watch.

The knight tries to go, but he was blinded by tapestry. Margaret helps out by unraveling the tapestry, sending the knight spinning about. Dennis jokes that Margaret is trying to have the knight "stir-fried", only for the dragon to continue to breathe fire on the knight. Dennis skateboards to the knight and picks him up. Dennis shields himself from the dragon's fire.

As Arthur is still deciding on what crown to wear, Professor Mentalapse comes back and says the latest knight was toasted by the dragon. Sir Dance-a-lot agrees to try to get rid of the dragon. Sir Dance-a-lot continues to dance about, hoping to distract the dragon. The dragon is angered when Sir Dance-a-lot breakdances. This leads to Dennis grabbing a spear and sending Sir Dance-a-lot dancing away. Gina, Jay, and Margaret found Sir Dance-a-lot's moves funny.

Arthur is later informed that all his knights failed to slay the dragon. Dennis gets the idea to attack the dragon. Dennis finds Dragon fast asleep, and tries to taunt him by telling him to wake up, but to no avail. Dennis tries a second time, and Lizard Breath wakes up. Dennis skateboards as fast as he could, and Dragon chases after him, breathing fire in the process.

Dragon gets exhausted, and Dennis motivated him by throwing a rock at him, prompting him to get up and continue the chase. The entire plan was to drop the drawbridge on Dragon's head, and Gina, Jay, and Margaret succeeded in doing so. After that, Arthur knights Dennis as Sir Dennis of the Roundtable. Dennis has his photo taken with Arthur.

As this happens, Dragon wakes back up, angrier than ever, and kidnaps Margaret. Professor Mentalapse, Dennis, Gina, and Jay use the time machine to go after Dragon. Margaret is more disgusted by Dragon's breath. The time machine flies around Dragon to try to make him dizzy and let go of Margaret. Dennis uses fire extinguisher to put out Dragon's fire breath, which makes Dragon exhausted, giving Jay the chance to save Margaret. At last, Dragon was extinguished.

It is now time for Professor Mentalapse, Dennis, Jay, Margaret, and Gina to go back to the year 1986. Margaret doesn't want to come out unless Dennis, Gina, and Jay promise not to laugh. When Margaret, covered in fire extinguishing foam, comes out, Dennis, Gina, Jay, and Professor Mentalapse break their promise and laugh at her.

Trivia

 * When Dennis is waking Dragon up, and while Dragon chases Dennis, the show's theme song plays in the background.