This is how Meeting Nimue, the Lady of the Lake/Reuniting with Megatron goes in Ryan and the Black Knight.
[Ryan and the gang arrives at a lake]
Caliburn: We're here.
12th Doctor: Where, Caliburn?
Caliburn: Where the Lady of the Lake lives, Doctor.
[Ryan and Sonic saw Amy Rose]
Nimue: I've been waiting for you, knights from other worlds.
Caliburn: Fool! Where are you going!?
Sonic: But, that's...!!!
Ryan F-Freeman: I think you are being rude to the Lady of the Lake.
Caliburn: How did you know that?
Ryan F-Freeman: How did I know what?
Caliburn: Bow your head.
Crash Bandicoot: Huh? [to Sunset] What is Ryan doing?
Nimue: I think I know why you and your friends are here. It's about Excalibur, isn't it?
Ryan F-Freeman: Yeah.
Sci-Ryan: looks like Ryan is not a smitten kitten for the Lady of the Lake.
Evil Ryan: Ahem. [gestures to Sunset]
Caliburn: Show some respect, Sci-Ryan.
Sci-Ryan: Sorry, Sunset.
[Evil Ryan shakes his head then turns to Nimue]
Evil Ryan: Hey, excuse me, m'lady. But you didn't happen to see an alien robot who goes by the name of Megatron, did you?
Nimue: Of course. Follow me.
Caliburn: Who is Megatron, Ryan F-Knaveman?
Ryan F-Freeman: My name is actually Ryan F-Freeman. But that was a good try.
Sci-Ryan: Ryan F-Knaveman? [chuckles] Good one.
Optimus Prime: Sci-Ryan, please. [to Caliburn] Megatron was once my arch-enemy. He was the leader of the Decepticons. But when Ryan freed him from the blackness in his heart, we are once again brothers.
Caliburn: Oh. I see.
Ryan F-Freeman: And that blackness is my mentor's brother, Unicron the Chaos Bringer.
Chuck (Angry Birds): Huh? Did Ryan said the name Unicron?
[Bertram nods and he and the others arrive where Nimue found Megatron]
Nimue: This is where I found the robot knight.
Bertram T. Monkey: Galvatron?
Megatron: That's Megatron.
Bertram T. Monkey: MEGATRON!!! [hugs Megatron] I am so very happy to see you again!
Megatron: Okay, Bertram. Easy.
Ryan F-Freeman: How did you end up here?
Megatron: When that wizard girl opened the portal, I landed in this lake and this kind lady who looks like Sonic's girlfriend found me.
Sci-Ryan: Wizard girl?
[Megatron points to Merlina]
Sci-Ryan: Oh. You mean her.
Evil Ryan: At least this armor of yours does blend right in this kingdom. My mentor's granddaughter, Merlina... [gasps when he realizes what he said]
Evil Ryan: I just blurted out that Merlina is Unicron's granddaughter.
Crash Bandicoot: I thought your mentor is Merlin, Evil Ryan.
Evil Ryan: Oh.
Sci-Ryan: That means... Evil Ryan is a student of Merlin, Merlina's grandfather.
Ryan F-Freeman: And Merlina is not Unicron's granddaughter, but Merlin's.
Ryan F-Freeman: Merlin is the grandfather of Merlina.
Caliburn: Wow. You are a smart one, Ryan F-Knaveman.
Sci-Ryan: [laughs crazily] Ryan F-Knaveman! I get it. Oh boy. [resumes laughing and hits Megatron with his Keyblade]
Odette: What's got into my friend, Megatron?
Megatron: He was little clumsy.
Bertram T. Monkey: Oh. At least I did well protecting Sunset as new bodyguard for Megatron's death.
Megatron: What? Did you become Sunset's bodyguard?
Bertram T. Monkey: Uhhh. I can explain.
Megatron: Explain what? That you being using Sunset for your personal use and your friends?
Bertram T. Monkey: Uuh. No. I think I did well as new bodyguard.
Megatron: DO NOT TAKE ME FOR A FOOL, BERTRAM!!!
Bertram T. Monkey: Sorry. I thought I was keeping her safe. I'm sorry!
Ryan F-Freeman: Ow. At least you did yell sometimes.
[Megatron nods and picks up Bertram]
Bertram T. Monkey: Look. I've been keeping Sunset safe from those knights from the underworld. Evil Ryan help Sunset while he's in gun mode.
Ryan F-Freeman: At least I absorbed some of Ivy's abilities. [summons a dragonfly] Look at this!
[The dragonfly flies to Sunset and she felt dizzy]
Megatron: Sunset? You remember me?
Sunset Shimmer: Yeah. Remember who?
Ryan F-Freeman: Don't worry. She'll recover. That was a test.
Sunset Shimmer: Where's Mighty Eagle?
Chuck (Angry Birds): And if Megatron is a good guy, how come Ryan didn't see Twilight in her Cybertronian form?
Evil Ryan: I don't know.
Bertram T. Monkey: Me too.
Batman (The LEGO Movie): Guess we may never know.
Ryan F-Freeman: Well, Megatron. Sunset thought you were dead and Bertram protects her from the Knights of the Underworld.
Nimue: I'll tell you and your friends how to hinder the Scabbard's power of imortality. I'm the one who give it to him so, it's kinda my fault. See? But still.....
Jessie Primefan: See what?
Nimue: Whoever defeats King Arther and takes his scabbard. Might end up turning out the same way. Right?
Sci-Ryan: Uhh yup.
Caliburn: I see.
Nimue: So I have three tests for you and your friends. Would you like to hear them?
Sonata Dusk: Yes.
Aria Blaze: Tell us.
Nimue: First, free the innocents from King Arther's dungeon. Second, offer compasion to those in need. Third, defeat King Arther's knights of the underworld.
Zoey: Sound easy.
Nimue: You have 3 days... Good luck.
Ryan F-Freeman: Can somebody explain to me what's going on please?