SMG4: Mario VS Youtube is the twenty-eighth episode of Season 10 and the five hundred and eighty-ninth overall to be uploaded by SMG4.
This episode is also the first officially announced episode and the sixth episode of The YouTube Arc. It was aired on August 1st, 2020.
Welcome to The Youtube Arc.
The episode starts at SMG3's castle days prior, where the anti-cast is working on a plan to steal the YouTube Remote from the YouTube headquarters, with SMG3 planning to use it to rebuild his studio after it was destroyed by Isabelle and Sans as a result of SMG4's tampering. Although Mario was hesitant at first, SMG3 managed to get him into the plan when he reminded him of Greg's death at the hands of Susan Wojcicki.
Sometime later, the gang, mainly SMG3, Mario and JubJub Boopkins managed to infiltrate into the remote room, and faced off Susan, who turned into a Barney-shaped creature who tortured the three, although they managed to defeat hear, they, along with the rest of the gang, was kicked out of the building after Susan used to Ban Hammer on them.
Disappointed, it wasn't until Shroomy, in his Demon Hunter persona, appeared with the remote, and it was revealed that SMG3 had a plan B in his pocket, aware of Shroomy's past, and threw a demon mask to awaken his alter ego, therefore allowing him and his boy scouts to steal the remote while Susan was distracted. Now with the remote, SMG3 revealed his true plan: to destroy SMG4 once and for all, and delete him. Knowing that Mario would be a snitch, he betrayed him by summoning the Content ID to kidnap and send Mario to the Internet Graveyard to prevent that from happening, while the others look on at SMG3's descent into tyranny.
The scene changes to July 25th, where Mario is seen recapping the events, while SMG4's face had a nerved look, knowing that the SMG3 would totally do anything with it, confirming his rumors of his evil intentions, and decided to call Luigi, Axol and the others to stop SMG3 and the Snitch Productions, thus starting the new arc.