As Mario was walking out of the castle, singing You're Mine by DAGames, he met the Happy Mask Salesman, who sets up shop outside of the castle. As the salesman tried to offer his masks to fight against the current pandemic, Mario instead salvages his bag of forbidden masks, including Majora's Mask which ran away, forcing the salesman to chase it. Then, Mario found a mask in his likenesses, and puts it on for himself, but finds it useless. Dropping it on the ground, Luigi found it, and wore it, and was cursed by the mask as it controlled his body.
By then, the controlled Luigi began to act just like Mario, with Mario approving it while it caught the attention of Meggy and Axol. As Meggy tried to greet the cursed Luigi, he ran away, causing the rest to apprehend him, while Mario took away the mask by ground pounding on him. The ejected mask then became sentient, later controlling Axol.
As the cursed Axol went out of control, the rest tried to stop him, but failed as Axol threw curse-masks at them, turning them into cursed versions of themselves. A particular mask eventually anthropomorphised Melony, who became a beautiful yet silent and sleepy anime girl. As Melony walked to a bush to sleep, the cursed Axol walked up to her and scared her, causing him to be slapped and the mask removed. The now uncursed Axol removes the masks from his friends, and they all immediately walked to the sleeping Melony. Eventually, the Mario Mask later cursed Meggy, who became too powerful for the rest to defeat.
Fortunately, Mario had a plan. He woke and made Melony to use her hacking skills to call for an Uber Eats delivery of a plate of spaghetti, in which he placed the Beeg SMG4 mask to enlarge it to distract the cursed Meggy. Eventually, the three apprehended her and removed the Mario Mask. As the Mario Mask was about to curse them again, it was later subdued by the salesman. As the salesman cleaned up everything, everyone was relieved until the salesman tried to remove the mask from Melony, but failed, causing confusion among the brothers and Meggy, while Axol was infatuated.
SMG4: War Of The Fat Italians 2020: Melony, a former member of Anti-Cast, is present in this episode, and is transformed into a human by the Fierce Deity Mask. Also, Meggy still has her new human voice after SMG3's accidental attack on Meggy.
Trivia
This marks the debut of Melony as a human. However, it is currently unknown if her mask is returned to the Salesman or kept it with Melony permanently. However, it is revealed in the next blooper, it is kept with her permanently.
A few days later after this blooper was released, Melony's human model was released on the steam workshop.
This is the first appearance of Axol since SMG4: Food Wars, over 2 months prior.
Mario broke the Fourth Wall by stating that Axol doesn’t have an interesting personality, a possible "Take That" to those who are begging for him to appear in videos.
At the beginning of the video, as Mario walks out of the castle, You're Mine, a fan-made Baldi's Basics In Education And Learning song by YouTuber DAGames (William Alexander Ryan), can be heard.
Luke was originally going to use the Polish Cow song. This was revealed in the Hobo Bros video "SMG4 talks about Melony & "Mario's Mask Of Madness"".
When Melony was transformed into an anime-like human girl, Mario had broken another Fourth Wall by complaining that she is another "anime thot", a reference to complaints from older fans about how there are already fourotheroriginalcharacters that are all anime-esque females who take up much of the cast.
The Mask: This blooper is parody to this superhero film starring Jim Carrey.
COVID-19 pandemic: The Happy Mask Salesman mentioned the ongoing pandemic and he said that the only way to avoid the fate by buying one of his coronavirus masks.
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