The video starts off with Mario introducing himself and his new restaurant to the viewer. After walking through the result of SMG4 getting bored in Gmod, Mario introduces Bowser to the viewer, who is obviously hard at work humping a melon. Mario is disturbed (who wouldn't be?) and gets Bowser back to actually cooking edible materials. Cue the title card!
Mario and Bowser first attempt to make Italian ravioli, the second best dish in the world. Mario tells Bowser to hand over the ingredients, but instead of buying the ingredients, he bought Doritos instead (thanks to the shop owner). Mario calls Doritos stupid and gets punched into a shelf of very expensive ingredients.
Bowser throws a bag of Doritos onto the stove, which somehow transform into ravioli thanks to the power of good editing. Mario, somehow surviving one of Bowser's punches, attempts to consume the ravioli, but a plate of spaghetti sees him. The spaghetti, incapable of handling this "rejection", proceeds to shoot Mario with a machine gun for "cheating on" it.
Next the duo tries to make a Yoshiomelette. Mario spots some Yoshis and sets off an overly elaborate scheme. Dr. Robotnik gives Birdo a signal, who gives Link a signal to throw a rock at a Bob-omb near a Toad's table. The bob-omb blows up the Toad, causing him to panic and hit a "FIRE" button. Heavy runs through with a sandwich dangling from a ladder on his back, where he touches a button that summons toast. The Shy Guy manning the front desk then grabs the toast and hits a button that causes Bowser to descend from the ceiling... where he promptly breaks the table the Yoshis were sitting at. Oopsie. Then one of the Yoshis lays an egg. Back in the kitchen, Mario cracks the egg, only for James Doakes to come out of it and say "Surprise, motherf**ker." Mario is frightened by this.
There's still a lot of video left, so SMG4 has the two cook up some Old Man Soup. Mario calls in Bowser to help him find an old man. Bowser cocks a shotgun and follows Mario outside. Mario spots an old man and goes searching for him, while Bowser screams like a little girl. The old man brutally mangles Mario, so Bowser throws his shotgun at him rather than firing it. Bowser's grandmother shows up for some reason and tells him to "do the right thing". He then proceeds to use his fire breath... which somehow misses the old man and sets Mario ablaze. The old man starts chasing after Bowser, who attempts to escape but gets stuck in the doorway and is being rapidly assaulted by the old man. Mario says that "he's got you bro" and proceeds to use a tank to subdue the old man. One jump cut later, the old man is in a cage, Mario appears to be somewhat injured/exhausted/mortified, and Bowser has a missile up his butt. Mario tries to get the old man to make him soup, but he refuses. Mario then punches the old man, who poops out the soup and flies away. However, the soup was cold. This made Mario very angry, so he chases after the old man while shouting "YOU SON OF A B*TCH!".
Mario then tries to make "a simple dish", but is interrupted by an old lady who appears out of nowhere and yells "Raisins!". Mario tries to get the old lady to go away, but she pulls out a gun and aims it at Mario. The old lady then rambles off a list of raisin ingredients, which include: cottage cheese, medicine, a scroll, a football helmet, a graveyard, and an old man. Bowser appears in the kitchen and tries to tell Mario that there is a situation, but an ax gets thrown at him by the old lady. Mario follows Bowser outside, who reveals that the Shy Guy cashier isn't there anymore. Meanwhile, elsewhere in the restaurant, SMG4 is demanding that he receives a burrito. The Shy Guy cashier shows up at his table and realizes that he has toast on his tray, so he completely obliterates the table in an attempt to retrieve the toast. Mario decides that he has to be the cashier, leading to a short segment that's basically an SMG4-ized version of "Mario's Restaurant ".
The final "cooking" segment is a special guest segment. The special guest is Tinky Winky, who announces that he will be cooking Tubby Custard . Bowser comments on how this isn't going to end well, while Bowser Jr. appears in the background and acts like an average Gmod ragdoll. Tinky Winky reveals his assistant, Walter White, who proceeds to make a bowl of Tubby Custard behind curtains. Mario complains that he wants to watch Walter make the custard, so he runs past Tinky Winky's curtains. Walter White puts some weed into the Tubby Custard bowl. Mario proclaims that using plants to make Tubby Custard is boring and adds a mushroom to the unfinished bowl of custard. This causes an unusual chemical reaction to create Shrek, who emerges out of the pot and starts going crazy to Caramelldansen, trashing most of the restaurant and rockets out of the restaurant towards the moon.
Bowser announces to the viewer that the events that just happened were all they had time for, and he expresses regret that he couldn't show how he makes his famous "chili" biscuits. He eats a biscuit and farts fire, which burns a nearby Toad's flesh. Bowser wonders why Mario hasn't said anything and questions if he's alright. Mario is shown to be in a traumatic state after seeing mysterious symbols on Shrek and Tinky Winky that he believes are connected to the Illuminati. Mario snaps out of his weird state and yells "ILLUMINATI!". Dr. Robotnik hears this, shows up and asks what happened to his restaurant. Mario, Bowser, and the Shy Guy abscond after realizing that he figured out that they stole his restaurant from him, which is revealed to be "Pingas Restaurante". Afterwards, SMG4 is still demanding his burrito, then gets shot by Robotnik.
When Bowser's grandmother disappears, she makes a Boo laugh.
When Tinky Winky says "Eh oh!" and "Tubby Custard", he has Po's voice instead of his own.
The scene with Luigi is inspired by a YouTube video called "Mario's Restaurant". It even had the audio from it.
When Shrek flies off to the moon, it can be said that it might be a reference to a YouTube video known as, "Check Yourself, Before You Shrek Yourself". The moon, despite being full in this blooper, can remember that the DreamWorks logo has a moon.
Running gags: SMG4 demanding a burrito and Toad getting burned.
The music playing when Bowser attempted to get the old man off of Mario by using his fire breath (which failed as he ended up setting Mario on fire) was the first opening of Attack on Titan.
In the "How to cook: Raisins?" moment, the old lady said random stuff and not real ingredients on cooking raisins.
This is a reference to a Game Grumps video.
When Mario yells "ILLUMINATI!!", you can notice that the same "ILLUMINATI!!" scream was used on the Smosh Video: How to be an YouTube Commenter.
This might possibly be an part of an running gag where a character uses random lines from Smosh videos.
The video also used the "AW SH*T HE FIGURED IT OUT" from a random Smosh video.
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