Back at the castle Koopa prepares for a wedding for him and Peach in Kamek's lab. Where Kamek works with a potion creation set up with another reptile that looks similar to him but is wearing red instead of blue.
Koopa: Kamek have you finished the potion yet?
Kamek: No sire. Potion making is a very delicate process.
Red robed Magikoopa: We've been working on it for a few minutes, we got to make sure there's enough of a Super Mushroom.
Kamek: My assistant has a point, mushrooms are an important part of any potion sire.
Red robed Magikoopa: Yes but it has to be a red mushroom not a green one.
Koopa: Why is that?
Kamek: Because sire it will cancel out the effects of the potion.
Koopa: Fine, just let me know when the potion is ready. This wedding has to happen within four days or less as that's when the dimension bridge is at its strongest.
Kamek: Yes my lord.
Koopa walks out onto the balcony of his castle where his blue shelled general who is ordering troops is standing.
Koopa: General Mugger, any news from the Goombas we've sent to the Mushroom Kingdom?
Mugger: Yes, the two human plumbers who call themselves Mario and Luigi have arrived there and are going to see the Kong's with the help of two Toadstoolians. I believe it's to rescue the Yeelah princess, your highness.
Koopa: Are you sure? Or are you just saying that based on an assumption? I want you to send the Hammer Bros. after them!
Mugger: Yes, my lord.
Mugger leaves and Kamek comes out of his lab and onto the balcony where Koopa is.
Kamek: Sire, the potion is ready.
Koopa: About time. Tell Beedleman to take it to her.
Kamek: Yes, king. Beedleman go give the potion to the princess.
Beedleman (O.S): Yes kamek.
Peach sits in her room trying to figure a way out of it. Beedleman walks in with a drink for her. This is not a drink though it's a potion but not just any kind though, it's a love potion.
Beedleman: Here's a drink for you soon to be queen.
Peach: What are you talking about?
Beedleman: Why, the king has already said that he wants you to be his bride. He had me make you a drink to make you comfortable. Take it, it's special.
Peach: Well, I don't want it.
Beedleman: I insist it's a custom of the Koopa clan. Take it.
Peach reluctantly takes the "drink" out of Beedleman's claws and sets it down on the table. Mugger goes into the barracks and walks over to the Hammer Bros.
Mugger: King Koopa has requested that I tell you to go after the humans in the Mushroom Kingdom.
Hammer Bros: Yes sir.
The Hammer Bros. salute to their general and grab bags with hammers, axes and boomerangs leave the barracks with Mugger in front of them and they approach a small airship which the Hammer Bros. with their gear board and leave. The four heroes set out to the Kong Kingdom but are ambushed by the four Hammer Bros. on the outskirts of the Mushroom Kingdom.
Hammer Bro 1: In the name of King Koopa, we arrest you!
Mario: What the hell are those?
Hammer Bro 2: Surrender immediately.
Toad: Those are Koopa's top soldiers, the Hammer Bros.
Luigi: What should we do Toad?
Toadette: Just walk around them, they'll leave us alone.
Hammer Bros: GET BACK HERE!
As the Mario bros. and fungi siblings try to leave the Hammer Bros. reach into their backpacks and begin to throw hammers, boomerangs and axes at them.
Hammer Bro 3: Take this plumbers!
Hammer Bro 4: Have a boomerang to your face.
Mario: Ow! Hey that hurt.
Hammer Bro 1: Well, it should have.
Mario Luigi, Toad and Toadette begin to run as the Hammer Bros begin to give chase until they eventually make it to a bridge.
Hammer Bro 1: There's no escape now.
Luigi: Oh yeah that's interesting because.
Luigi runs onto the bridge holding Mario's arm with Toad and Toadette following behind.
Hammer Bro 2: You totally showed them bro.
Hammer Bro 1: Shut up! We have an order and we will execute it.
Mario: What are we going to do?
Luigi: I don't know Mario.
Toad then rummages through his backpack and grabs a pickaxe.
Toad: I'll handle this.
The Hammer Bros. are halfway across the bridge when Toad hits the rope on their side of the bridge with a pickaxe. The bridge snaps causing the Hammer Bros. to fall into the river and they try to swim to the other side. The Hammer Bros. leave, going back to their small airship. The brothers and fungi continue walking, they see some fish jumping in and out of the water and just brush it off as nothing, they go through a large cave on the map Toad and Toadette flick on their head lamps then waving the Mario brothers into the cave.
Mario: What a huge cave.
Toad: This is the burial ground of Koopa's army. I think. We should be careful and leave quickly.
Luigi spots some twitching and shambling movement in the darkness.
Luigi: Mario, did you see that?
Mario turns around to face his brother.
Mario: See what?
Luigi: I don't know but whatever it was it was limping.
The fungi siblings stop in their tracks when they hear what was said by Luigi.
Toad: Luigi what did it look like?
Luigi: Well, I couldn't really see it.
Toadette: Did it look like this?
Toadette pulls out a drawn picture of a skeletal turtle creature with armor.
Luigi: Yeah, something like that.
When the four turn around they see a horde of skeletal turtles wearing armor with glowing yellow eyes standing behind them.
Mario: What are those things?
Toadette: They're Dry Bones. Undead warriors of Koopa's army which have been reanimated due to Kamek's magic.
Luigi: What do we do?
Mario: I say we run!
Toad: Good idea.
The four run through the cave as the Dry Bones, now with red eyes, give chase limping and falling apart and put back together in fast motion. When they think they're in the clear they see a lava pit and Luigi ends up tricking one of the Dry Bones' heads to fall into the lava. They wait and hide behind a rock and the Dry Bones' or at least some of them fall into the lava. The four leave the cave, end up in a desert, and continue their trek through it and another grassy meadow. At night Mario, Luigi Toad and Toadette set up camp.
Toadette: Hey you guys alright.
Luigi: Yeah, just in a little bit of pain.
Mario: Yeah, we've never been through anything like this.
Toad: I bet, what's your dimension like?
Luigi: It's not too bad. We have money, we have a house, it's nice.
Mario: It ain't too good either. Our old boss, before we left to start our own company, was a pain in the ass. We worked as demolition and construction workers. The name of the company was called Wrecking Crew.
Luigi: Yeah, Mario here tore into the guy one day.
Mario: I said some things I should've kept to myself, but I didn't that day. Spike, yeah that was his actual name, used to torment me and Luigi while we were working intentionally sabotaging his own job sites.
Luigi: Yeah, Spike really didn't like me or Mario. He even tried to get me to mess Mario up.
Toad: Wow I'm sorry that happened to you guys.
Toadette turns to the fire before turning back to everyone else.
Toadette: We should go to sleep. It's late.
Everyone nods in agreement and goes to sleep.