School's In, Oh Bummer! is the forty-ninth episode of the first season of Mighty Magiswords. It was released in the Cartoon Network website in December 8, 2017, it aired in Cartoon Network Phillippines and Southeast Asia and aired in the United States on April 22, 2018.
It turns out that Vambre and Prohyas didn't graduate the Adventure Academy after all and need to go back to school earn their diplomas.
- Prohyas Warrior
- Vambre Warrior
- Witchy Simone
- Cattus the One Blade
- Professor Cyrus
- Botticceli the Tortoise
- Professor MaBarnacle
- Fencing Magisword (debut)
- Little Blue Bomb Magisword
- Waffle Magisword
- Roundabout Magisword
- Tickle Magisword
Super Teamwork Combo
Roundabout Magisword + Tickle Magisword = Tickle Twist
- Grup gag: Same as "Unconventional Dolphinism".
- This episode marks the debut of Cattus' adult self in the TV series.
- This was Glori's second appearance since "Biggest Fan".
- Hoppus reveals he is terrified of tortoises, believing they are a natural enemy of rabbits and impossible to outrun. This refers of Aesop's fable The Tortoise and a Hare, though Hoppus grossly misinterprets the circumstances of the story.
- A bronze statue of Kablammica Warrior is seen in the Adventure Academy. The statue depicts Kablammica with two legs and a full set of eyes, implying her left pegleg and potentially-missing eye happened after her retirement from adventuring.
- Professor Cyrus' line, "Magiswords uses strictly against rules!" and the Warriors' line, "If using a Magisword, we'll get the job done, why not use them!" are the exact dialouges or a callback reference of every Adventure Academy shorts.