The gang participates in a school event that combines the Academic Decathlon and the Athletic Decathlon.
Milo and his comrades are surprised to learn that their school's academic and athletic decathalons have been combined into a single event by Kyle Drako, who also oversees the event. To their chagrin, the mixed group of athletes and academics find that the opposing team has been aware of the event for three months, leaving them fully prepared. As a result, they quickly take the lead in the competition, leaving Milo's team in the dust. Meanwhile, Martin and Brigette Murphy come to the school to drop off some items for Milo (including his body armor) and end up searching for a Soccer trophy Martin won in his youth.
Thanks to Murphy's Law, the field on which they are competing is left a ruin, though Milo is confident that this actually improves the group's chances due to his experience with such setbacks. The two teams then face the final event, making their way over the field to various computer terminals in order to answer questions. Little by little the teams are worn down until only Milo and the other team's captain remains, with Milo triumphing due to Melissa's knowledge of trivia. Meanwhile, Martin inadvertently causes some damage to the school while on his search for the trophy, and he and Brigette leave before more is caused.
For a full transcript of "Athledecamathalon", click here.
There are six Middletown Middle School Middlemen but only five are ever seen at one time. Wendy, the brunette girl and the blonde boy alternate in and out from scene to scene when the Middlemen are introduced, for the remainder of the episode the blond boy disappears.
In Mr. Murphy's flashback, he makes a winning soccer move with one kick, yet he imitates it with multiple kicks.
When Milo's team is celebrating their victory, Zack's left foot is superimposed on top of his right foot.
During the Javelin geography contest, South Sudan is still seen as part of Sudan.
In the crowd of people cheering for the Geckos at the end there are recoloured character templates of Martin, Brigette, Wendy, and the dark haired Middlemen girl.