We open up in London as a young girl and her grandfather are on the run through the sewers.

Kai Green (The granddaughter of a retired Plumber who was friends with Max! She usually remains calm and collected in most instances but has a bit of a teasing side to her!)

Wes Green (Kai's grandfather and a former Plumber who was friends with Max!)

Kai: How can you even be sure it's real Grandpa? I always thought it was just a story.

The two are searching for a certain laboratory beneath London.

Wes: If you read between the lines, Robert Louis Stevenson's clues were unmistakable and lead right to-

They manage to uncover the entrance to the laboratory.

Wes: Get behind me Kai!

As the passageway opens up, the lab is in full view.

Kai: Whoa!

There was a vial right in a table full of lab equipment!

Wes: This is it! Dr. Jekyll's secret laboratory, and his legendary formula.

???: Which now belongs to us!

Suddenly, Sir Morton, and a group of Forever Knights appear.

Behind them was Chadwick, the Forever King himself!

Chadwick: The Royal Order of Forever Knights thanks you for your assistance in recovering our formula.

Wes: Your formula?

Chadwick: The good Dr. Henry Jekyll was one of our order, crafting alien blood into a super serum for our knights to use in battle. We shall take it and be on our way.

Wes grabbed some explosive chemicals and threw them right at the Forever Knights!

Wes: KAI!! RUN!!

Morton: Oh no you do-

Kai easily evades Morton, and before Wes could move, the Forever Ninja restrains him!

Chadwick grabs the formula with a big smirk on his face.

Chadwick: One vial is more than enough for my- Uh, ahem, our purpose. Bring the old man to the castle, we require his expertise to acclaim the sword.

As they drag Wes off, Kai made her escape and took out her cell phone to call for help.

Soon...

The Proto-TRUK had arrived in London above the River Thames.

Ben: Honestly, I don't need help in London.

Weiss: Really?

(Y/N): After the mess with Zombozo, I'd say you need all the help you can get. Or it's because of something else.

Ben: Huh?

Rook: (Y/N) means that you still have feelings for your childhood crush, Kai Green, even though she found you interesting when she thought you were a werewolf?

Ben had a confused look on his face.

Ruby: Gwen mentioned it.

Blake: Boy, she had a lot to tell us about how you were as a kid.

Ben: It wasn't a crush, I thought she was different.

Rook: I'm just excited to experience another area of earth. Did you know that despite its rainy reputation, the average annual precipitation in London is only inches?

Yang: Oh no, another lecture. Wake me up when we find this Kai, chick.

Yang already takes a nap.

Weiss: Ugh, Yang; this is interesting. Go on Rook, we're all listening.

Ben: (sarcastically) Yeah, what Ice Queen sa- Oof!

Weiss punched Ben.

Ruby: Weiss, that was a bit uncalled for.

Weiss: He deserved it.

Rook: Well, it's less than half the average rainfall of New York City.

Blake: Huh, that is interesting. I wonder if there are some more history books we can find here.

Eventually...

You all met up with Kai.

Kai: Thanks for coming all this way Ben, I didn't know who else to call.

Ben: Whoa! (Blushing) Uh ... Kai ... you got ... taller.

Kai: It's only been six years, you're taller too, you goof.

Ben: Way too tall to be a house pet.

Kai: Come on, you had furry ears and a tail, and- Nevermind, I have to rescue my grandpa.

Yang: Damn, I like her already.

Blake: Definitely the serious-type.

(Y/N): Oh, Kai, we're Ben's friends. That's Rook, Ruby, Weiss, Blake, and Yang. And I'm (Y/N).

Ruby: Hi!

Weiss: A pleasure to meet you.

Blake: Hello, Kai.

Yang: What's up, girlfriend?

Rook: Greetings Ms. Green- I-

Kai: Yes; hello. I just need the backup.

Ben: Backup? Uh, in case you can't tell, I'm a famous hero! I've saved the universe more times than I can count!

Rook: The official count is 3.

Ruby: But wouldn't that mean Ben can't count that high?

Ben: Uh ... it should be more! Either way, Ben Tennyson is no one's backup!

Kai: So you don't want to help.

Ben: Well, we're here already so-

Yang: Yeah yeah, old friends, we get it! Let's speed it up!

On the road...

(Y/N): Wait, Dr. Jekyll's lab?! As in the Dr. Jekyll from The Strange Case of Dr. Jekyll and Mr. Hyde?!

Blake: Good book.

Ben: No way, that's just a story.

(Y/N): Says the guy with the watch that can turn into aliens. So, what do those Forever Bastards want with your grandad?

Kai: They were taking my grandpa to a castle with a sword in it.

Ben: Oh that's easy. England only has like 3 castles.

Weiss and Rook: More than that.

Ben: With swords in them?

Weiss and Rook: Fewer.

(Y/N): Hopefully they don't have smart mouths like a certain one I know of.

???: Don't think I can't hear you, Fool!

Ben: What was that?

(Y/N): One of my swords, Caliburn.

You brought out the sword.

Kai: It ... actually talks?!

Caliburn: And I'm much more gifted than my wielder thinks of me.

(Y/N): You're still a massive smart mouth!

Ben: Oh boy, so, how would we find where the castle is?

Blake: It would take a long time, we need to research and look for-

Kai: I already know where it is. Look.

She showed a paper that said "Howl's Moving Castle and Storage."

(Y/N): Wait, wasn't this another book?

Blake: Hmm ... I think so.

And so...

The group arrived at a modern-looking building to search around.

(Y/N): Quiet like a mouse.

Ruby: Maybe we missed them.

You all start looking.

Kai: Someone was here, I know it.

Ben: Yeah; good work, Sherlock Holmes.

Rook: Careful Ben, while fictional, Sherlock Holmes has been regarded as-

Ben: Shush!

Kai then eyed Ben's Omnitrix.

Kai: New Omnitrix?

She tried to touch it.

Ben: Watch it, I could turn into Walkatrout or something!

Kai: So; you couldn't even change it into Benwolf if you wanted to?

Ben: I could, but I choose not to call him that anymore.

Yang: HAHAHAHAHAHAHAHAHAHAHA! BENWOLF?! THAT'S STUPID!!!

Ben: Yeah, well Blitzwolfer is cooler!

Weiss: You came up with it just now.

Ben: DID NOT!

Rook: If I may interrupt.

Rook finds some papers with drawings on them.

Kai: This is grandpa's!

(Y/N): I think that's Parliment Square. And-

There were statue drawings on there.

(Y/N): What does it mean?

Kai: Each statue represents a different London landmark.

Blake: Hmm ... something is off about this one.

(Y/N): Let's see.

You lit up on the map to show an X.

(Y/N): X. Kai?

Kai: Grandpa has it corresponding with the Royal Greenwich Observatory.

Rook: But the date is off.

Kai: Of course! There was a different statue of Cromwell in another part of the square.

(Y/N): Heh, looks like the old man lead them in the wrong direction. Smart move.

Ben: Then let's go in the wrong direction and kick us some Forever butt!

Kai: No! My grandpa is risking his life to be sure the Forever Knights don't find what they're looking for! It's that important!

Ruby: But Kai, once the Forever Knights get what they want, they'll kill your grandpa!

Kai: No, he can take care of himself, "Once a Plumber, always a Plumber."

(Y/N): Then let's head in the right direction then. Hmm ...

You found where to head next on the diagram.

(Y/N): Highgate Cemetery!