SMG4: Mario vs IT 🤡 is the 39th episode of Season 9 and the 537th overall to be uploaded by SMG4.
This is the ninth video of the Halloween series. It was aired on October 26, 2019.
"Not what "IT" is, Mario... but WHO "IT" is."
-SMG4 describing "It" to Mario
The actual episode starts on a rainy night, with Luigi playing in the rain with his doll. While he finds it entertaining, Mario finds no fun in it and proceeds to smack the doll out of his brother's hands and into a sewer current. As Luigi desperately tries to retrieve it, he is startled by Shrek the Ogre, who is then smacked out by Pennywise the Dancing Clown. Luigi asks Pennywise for his doll back, but Pennywise refuses and drags the screaming plumber down the sewer by the leg.
Mario is shocked at what's happening and wanting to save Luigi (because apparently, he is the only one who knows the Wi-Fi password as Greg The Alien changed it), decides that he needs to think like a clown and get help from the biggest clown he knows: SMG4. Upon telling SMG4 about the incident, SMG4 describes Pennywise, (also known as It), telling Mario it appears every 27 years to feast on human flesh and can take the appearance of one's worst fears. Mario initially denies it, until SMG4 shows him a picture of broccoli in the computer. Due to hating broccoli, Mario screams in panic, while SMG4 goes to get help.
Unfortunately, almost everyone is trick-or-treating, with the exception of Toad and Fishy Boopkins, so they are forced to come along with Mario and SMG4 to fight Pennywise. When they go into the sewers, they find Pennywise, who flings Boopkins and SMG4 against a wall, kicks Mario away, and rips Toad's mushroom head off after it terrifies him by turning into Toadette, killing him. SMG4 states that they need to use Pennywise's one true weakness: firearms. The four (with Boopkins carrying Toad's body) chase after Pennywise to none other than a mansion, which they enter after Mario tosses Toad's body in to make sure it's safe.
Mario freaks out at his own reflection in a mirror, but after he realizes it, the reflection turns into broccoli, causing Mario to freak out again. They chase Pennywise into another room, where it uses the mirrors to project everyone's fears. Mario throws his head aside, and grabs a gun and fires like a maniac to shatter the mirrors. Then, they see "Slenderman" playing a piano. Mario greets his friend, and asks how his wife and kids have been, but "Slenderman" wants a brofist, and Mario seeming complies, (with "Slenderman" getting ready to stab Mario) but at the last second, Mario turns on "Slenderman" saying that the real Slenderman would have started off with their secret handshake, which involves Slenderman throwing Mario over his shoulder. "Slenderman" is revealed to be Pennywise, who expresses dismay at the fact that Mario figured out that it was a trick, and retreats.
When the gangs chases Pennywise, a clown version Mario appears and attacks Mario at the kitchen. SMG4 is unable to help, being somehow incapable of telling whether Clown Mario is a fake or the real Mario. Boopkins sees an electric current and uses it to revive the dead Toad. This causes Toad to go on a adrenaline rush, singing Last Surprise from Persona 5 in such a horrible voice that Clown Mario's head ends up exploding. After SMG4 snaps Toad back into conciousness, the gang continues to chase after Pennywise, entering the bottom of the well in the courtyard. They discover a chamber where It reveals to have killed Luigi and takes on its form as Gooigi to attack the gang. As the group fights a losing battle against Gooigi, SMG4 discover the Poltergust in Luigi's pocket and sucks up Gooigi with it. Luigi is thus revived and thanks Mario for helping save him (though Mario still wants the Wi-Fi password). However, everyone soon realizes they can't get out of the chamber by normal means and the episode ends with SMG4 saying "ah, piss."
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