The Norrisville students entered the Mystery Shack. Stan Pines was in his suit.

Stan:Welcome to the Mystery Shack, out of towners!

The students were amazed by some of the strange items around the shack. When Mabel saw Heidi, she became instantly excited.

Mabel:Dipper, do you know who that is?!

Dipper saw that Mabel was pointing to Heidi.

Dipper:Who?

Mabel:Hedi Weinnerman!

Mabel ran up to Heidi with a look of excitement on her face.

Mabel:OMG! Heidi Weinnerman! I'm such a big fan of your show!

Heidi:Glad to see I have some out of town fans.

Dipper pulled his sister back a little.

Dipper:Sorry. She like a puppy, I.e very excitable

Randy and Howard were chuckling a little at Mabel's fangirling.

Mabel:I just saw your latest episode. You guys got attacked by the gnomes in the forest.

Heidi:You know them?

Dipper:You have no idea. How'd you guys escape them?

Heidi:We were saved by The Ninja.

Wendy:Ninja?

Theresa:The Ninja of Norrisville. He's protected Norrisville from monsters and other threats for 800 years. Trust us, we're used to getting attacked by monsters.

Dipper:That makes two of us.

As everyone began looking around the shack, Dipper decided to do a little research on The Ninja. He noticed every few years, The Ninja's appearance tended to change every few years.

Dipper:It looks like a new ninja is chosen every few years. And since The Ninja is here, its safe to say the current one is one of these Norisville students

Randy was hanging out with Howard.

Howard:I still can't believe you had trouble with gnomes.

Randy:Can you blame me? This is nothing like the Stank monsters or McFist's robots. What I am I supposed to do?

The Ninjanomicon began flashing.

Randy:B.R.B, Howard. Nomicon's calling.

Howard rolled his eyes. Randy ran into one of the bathrooms and opened the Nomicon, which shloomped him in. He landed in a Japanese  village with several villagers. Randy got up and dusted himself off.

Randy:Alright Nomicon, I could really use some ancient ninja wisdom right now. I had to fight gnomes! That also turned into a huge...gnome giant...thingy. I've never faced something like that. Who knows what else is in this town. What do you got?

The visual showed a doodle ninja fighting a bizarre dragon creature. The ninja was having a difficult time fighting. Then a strange cloaked man in a straw hat came up. The man removed his hat and cloak to reveal a noble looking fighter. The two successfully defeated the dragon. The dragon's fire revealed the text:

When facing an unusual enemy,

you must seek help from an unusual ally.

Randy:Unusual ally? You mean like those Pines kids? How are they supposed to help?

The dragon's fire shloomped him out.

Randy:Well there's no honkin way I'm telling them I'm The Ninja.

However, he didn't need to, as he saw Dipper standing right in front of him, with a smug look on his face.

Randy:Well, I shoobed up...

Meanwhile, back at the lake, Mcfist was still surprised who his new out of town partner was a kid.

McFist:So you're Gideon Gleeful?

Gideon:Villains come in all shapes and sizes, Mr.McFist.

McFist:Fair enough. So where is this "Gobblewonker" you mentioned?

Gideon:(Nervously)Heh, so here's the thing, I don't know where it is...

McFist:(Angrily)You don't know where it is?!

Viceroy:Hannibal, let him finish.

Gideon:Though I do know someone who can tell us. I'll tell you who, as a bit of a deal.

McFist:Go on.

Gideon:You help me defeat my nemesis, Dipper Pines, I help you take care of that pesky ninja.

McFist:That is, acceptable. So who knows about this lake monster's location?

Gideon:Dipper's twin sister, Mabel. They live in the Mystery Shack across town.

McFist:Ahhh! We just there!

Viceroy:I'll dispatch the Robo-Apes to get her.

Gideon:Actually, I heard those gnomes gave that ninja a difficult time. So I think I know something that could give him more of a challenge.

Viceroy:What'd you have in mind?

Gideon snapped his fingers, and out of the trees, came a Gremloblin!

Viceroy screamed and hid behind McFist.

Gideon:Presenting:The Gremloblin!

McFist:How many insane monster does this town have?

Gideon:You'd be surprised.

McFist:Oh this ought to be interesting...