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"Mad Cell" is the 18th episode of Mario and Luigi's Stupid and Dumb Adventures.
The video starts with Black Yoshi telling Mario that he killed Peach. Mario got mad, so he tackled Black Yoshi. Toad came in and saw the fight, then he ran away and decided to call 911. Toad described the problem and Goodman came into the room sometime later. He said that he got a call for a domestic disturbance and a dead body but in reality, they were just fighting, even though Mario told him that they were playing together. Goodman saw him above Black Yoshi, so that would mean for him that it is beating and he was yelling for help. Black Yoshi said that Mario was beating him, so Goodman took Mario to jail.
Mario didn't like jail and was arrested for beating Black Yoshi. Mario's cellmate is Bubbles, who made an incident to Mario. Next, they had a shower around 10 minutes later after the incident. They then went into the shower together, even though Mario tried to not go with him to shower. Something happened and that is when Mario escaped from the shower, with Bubbles coming out of the shower too. Mario made it to the jail cell.
At the Retard Court, the defendant was Mario and the plaintiff was Black Yoshi, with an inexperienced, but manipulative lawyer nearby, who said Black Yoshi was purely innocent. Mario told his side of the story and said that the power went off, he got chased by a ghost, and then he went into the room to see Black Yoshi playing Call of Duty, seeing Peach's dead body. Black Yoshi killed her, so Mario started choking him. The lawyer came nearby Mario and said that he was guilty. Goodman didn't believe his side of the story, only because he thinks ghosts don't exist and he needed video proof of the ghost.
- Starting with this episode, the Mario and Luigi's Stupid and Dumb Adventures episodes were no longer given specific titles, only being referred to by their episode number in the series.
- This episode marks the first appearance of the new Bubbles.
- As of September 2018, the video was deleted by YouTube due to its sexual content. However, the video was somehow restored but remained age-restricted.