Chapter one: Things Go Wrong

Plot

 * After hearing about a new Zelmore game on TV, Gumball and Darwin go out to buy it. Once they find a creepy old man, things start to go downhill quickly.

Chapter (warning some spoilers)
Gumball and Darwin are sitting on the couch watching cartoons, with bowls of cereal at hand. They laugh at a funny scene, and continue to eat their breakfast, relieved that they don't have to worry about school. A commercial interrupts the show, advertising the new Legend of Zelmore game, Breath of The Forest. The two are immediately excited about this and quickly run to the door. Nicole stops them, saying that they couldn't go just yet until they go get dressed. They soon head out the door once they're ready.

Gumball and Darwin walk down the sidewalk, checking if they have the money to buy the game. Gumball blabs on about how incredible the videogame is going to be, and the wonderful feeling of having it in their hands.

They soon stopped what they were doing, as they see a weird old man across the street, looking at what appeared to be a dead animal carcass. At first, the boys are highly disturbed by this, but joke it off like nothing would happen. The man notices them, and studies the two, which quickly stops their laugher.

Gumball and Darwin back away slowly, as the man dropped the dead animal, and is now focused on them. The weird man tries to convince the boys that he won't hurt them, but it isn't working. Gumball tells Darwin to run, but Darwin doesn't want to leave him, still staying with his brother.

Gumball is soon struck in the head by a baseball bat, and falls to the ground. Darwin realizes his brother's arm is bent at a wrong angle, while also seeing that the creepy man was the one to swing the bat.

Darwin tries to call out to his brother, but is struck and left in the same way as Gumball.

The last thing he sees is a horrified and shocked look on Gumball's face, as the creepy man picked him up with a smile.

Fun facts and cultural references!

 * This is the first appearance of Gregory Gilson.
 * The Tale of Zelmore game, Breath of the Forest, is a reference to Legend of Zelda, Breath of the Wild.
 * When Gregory Gilson is examining the dead carcass on the ground, this is a reference to Victor Frankenstein from the Frankenstein novel by Mary Shelley.

Continuity

 * The Tale of Zelmore has been referred to and shown in the show plenty of times in episodes.