The Illuminati is an evil triangular entity from 1000 years ago which was defeated but is expected to return in an extremely long time. It has also become a very (in)famous meme. It appears in SMG4's videos mainly whenever it's referenced. One example is in SM64: Cooking with Mario and Bowser 2! after Shrek trashes parts of Cafe Mario and makes a scene then flies up to the moon Mario suspects that Shrek and Tinky-Winky are linked to the Illuminati. Another example is in SM64: The SMG4 QNA (400k Subs :D) where Luca Haas asks if Mario is Illuminati. SMG4 denies this but at that moment, Fawful's laugh can be heard and various characters like Mario, Toad, Bowser, and Weegee, become possessed by the Illuminati and start chasing SMG4 as more comments about the Illuminati appear. The Illuminati is also referenced in other videos.