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He is a poorly-drawn, overweight meme version of Luke Lerdwichagul.
His only appearances in his debut episode are to be part of the screen transitions alongside Long SMG4.
He appears as one of the religious group icons alongside Long SMG4. He was then merged with Long SMG4 to become Bong SMG4 on the advice of Mario, much to the happiness of both religious groups involved.
Beeg SMG4 appears as the main antagonist of the episode. He was created when Professor E. Gadd fused SMG4 and Beeg Yoshi after wanting to make Beeg SMG4 a reality and did so by kidnapping SMG4 beforehand.
However, this resulted in Beeg SMG4 going into a straight collision with the Mushroom Kingdom and Termina (an alternate version of Hyrule) within three days, similar to the Moon from The Legend of Zelda: Majora's Mask, where its citizens attempted to stop Beeg SMG4 to no avail. Eventually, after getting a demon sample from an alternate dimension called The Upside Down and fusing it with SMG4's hair, Professor E. Gadd creates an enemy which successfully blasts Beeg SMG4 back to space, averting the collision. At the end of the episode, Beeg SMG4 reverts back to normal SMG4, who realized he was now stuck in space with no way of returning home (however, since Link and his horse showed up at the end, it can be assumed he hitched a ride with Epona).
He appears in SMG3's flashback, being held by SMG4.
Do you like Beeg SMG4?