SMG4: The Demon Among Us is the twenty-second episode of Season 10 and the five hundred and seventy-sixth overall to be uploaded by SMG4.
This episode was aired on June 13th, 2020.
Shroomy don't look too good...
The episode begins with Shroomy chasing a butterfly outside of Peach's Castle. Bob Bobowski goes outside and tells Shroomy that he's got a surprise for him. Saying that he loves surprises, Shroomy follows Bob, only to have a demon mask jumpscare him. As Bob taunts Shroomy for falling for the jumpscare, Shroomy's anti self takes control of his body and chokes Bob, which he tosses him aside. Grabbing a shotgun, Anti-Shroomy yells, "TIME TO HUNT SOME DEMONS!" before running out of the castle. Bob then annoyingly exclaims that some people can't take jokes these days.
Anti-Shroomy heads over to Aubergine to cause massive rampage, destroying an ice cream parlor, with Fishy and JubJub Boopkins inside. Seeing Bowser having fun with his son, Anti-Shroomy instincts kicked in, believing him to be the queen of all demons and tried to hunt Bowser down, who crashed into the brothers Mario and Luigi at an Italian restaurant, having escaped from the ice cream parlor before its destruction. Seeing the chaos of Anti-Shroomy, the brothers decided to take a taxi to the Bowser Protection Services building in the outskirts.
They arrived at the building, in which they, along with Tari and Saiko as volunteers, had Bowser in a safe "Protecc Room". Anti-Shroomy then arrived for Bowser, and quickly subdued, defeated, and captured everyone, including their strongest one Saiko, who kicked her so hard.
Everyone, including Bob, the originator of his hand-made chaos, were locked up in a cage near a historical medieval village somewhere in Rockford, witnessing Anti-Shroomy about to execute Bowser by burning him at stake. Pouring oil all over him, Anti-Shroomy was just about to set Bowser on fire until he was intervened by Normal Shroomy. Without hesitation, Shroomy, still in his body, punched his anti self, and started fighting it, while accidentally setting Bowser on fire.
Knowing that Shroomy would not be able to defeat his anti self, Mario and his friends tried to remind him of all the memories that they had together with Shroomy (although Mario's memories of him seemed to be bad). The help worked for Shroomy, as he managed to punch and defeat Anti-Shroomy, sending him flying into the space, returning to his normal self once he landed on the ground. Everybody else was released from the cage, and went home together, but not before a glimpse of Anti-Shroomy had caught the wonder of Shroomy, but it turns out that he forgot Bowser, who was already burned to a skeleton, ending the episode.