---Library, still. Twenty minutes later---
Twilight had Spike send letters to the rest of the group after he came back from the kitchen, sad that he missed what happened last chapter. The others are here now, and Marcus is once again holding Fluttershy like a stuffed toy, and Señor Tortuga was on his hat. She then told them he was a courier and from another universe that was shot in the head twice and buried alive
"This guy is why I am here and not practicing my stunts?" A bored Rainbow Dash said.
"He is clearly dangerous, no sane person would wear that crime against fashion!" Rarity saif.
"Ah was told this was important, Ah see nothing dangerous about this feller, other than the chance he's huggin' her too hard" A farm pony named Applejack said.
"He has GUNS and pulled a CHAINSAW out of that bag!" Twilight exclaimed.
"I can believe that, but I think it would be close to over-stuffed by itself." Rainbow Dash said.
Marcus then pulled a suit of power armor, a gauss rifle, a cowboy repeater, a revolver that played a tune as he pulled it out "I love that!", that special tesla cannon from the vertibird crash, and a flaming sword. Rainbow then proceeded to write what she said down and eat her own words.
"How does that make any sense?" Applejack asked Twilight, expecting her to know.
"I have no idea, since they claim having no magic in their world-" Twilight started to explain many things before Mark cut her off.
"Itz the BOTI Bag Compact edition! Same Bigger On The Inside Bag subspace teleportatation quali- quanti- koala... GROODALICIOUSNESS as normal one, less bigness to bug you! Iz pre-war stuff, which made no sense, so stuffs still weigh whatever." Mark explained.
"Why didn't you tell me that!" Twilight yelled at Mark, "I was messing with it for half an hour!"
"You never asked how my stuff worked when it is my thingies!" Mark immediately responded.
Fluttershy then finally found the courage to speak. "um, pre-war?"
"We got in a war a few hundred years ago and blew everything up, now having to contend with drugged up raiders, crazed robots, mutated wildlife, and the occassional crazed ghoul (zombies, but sane ones are perfectly normal). He used to go through that alone." Arcade explained, reminding everyone he was there, "In the words of a wise drunk-"
"Don't fuck with the guy who brings your mail!" ED-E blasted the sound clip of Cass out.
"Thatz me!" Mark added. Rarity nearly fainted at the profanity while Fluttershy was unfazed.
"WHAT VULGARITY!" Rarity exclaimed.
"Well, they live in a wasteland, and studies show that swearing reduces pain." Fluttershy said. The ponies in the room (Spike was lost in his thoughts imagining himself in an outfit like Mark's and shooting mutant zombie robots) looked at her funny.
"That remind me... Arcade! Go to Lucky 38 and send Cass over!" Mark said.
"That's not possible," Arcade started explaining to Mark, "She is in-" and then he faded from existence, generating looks of shock and horror from everyone but Mark and Pinkie Pie.
---Lucky 38 Casino, Mojave Wasteland---
"-another universe and..." Arcade noticed he was in the Lucky 38, "I... am back..."
Cass was staring at the man who just faded into existance in front of him, "I have a feeling this involves Mark?"
"Yes," Arcade said, confused as to how he got there, "Mark wants to introduce you to meet some colorful cartoonish ponies in another universe."
"How the fu-"
---The Library Again---
"-ck do I get... there..." Cass then saw the colorful ponies and Marcus. "Why did I somehow expect this... I'm Sharon Cassiddy of Rose... I need a drink..."
"I can get you some water or-" Twilight started to say, still confused as to how she got here, but was again cut off by Mark, this time with a bottle of whiskey flying over her head.
"Thanks"
"Why do you have-" Twilight began to ask Mark, but then he pulled out an absinthe bottle, several glowing bottles of soda, 76 toy rocket ships, and a car bumper modified into a makeshift sword, just to point out that they have been over this, "Right..."
Everybody else from the Vanilla game companions were eventually sent over. Fluttershy loved Rex, and everybody was surprised when... bollucks, what was the supermutant's name? They were surprised by her, then remembered they were with the male human version of Pinkie Pie. The companions that stayed were Veronica and ED-E.
"Well, introdunctions are made, I'm go do things now!" Mark said as he ran out the door.
"Should we be stoppin' him?" Applejack asked the group.
"Only if he attempts to bake. Cooking is good, MAGNIFICENT even! Vut you even have him pour flour in a bowl for the purpose of baking, it'll somehow catch fire." Veronica explained.
Pinkie's eyes went wide as she realized "Sugarcube corner is that way!"