Here is the scene where Black Doom, Demon God Demigra and the Villains reveals the truth in G-Merl's Eternal Quest.
[Team Robot and Goku reaches towards the Villain's.]
Black Doom: Well done, G-Merl and your friends. You've gone farther than I expected... we're impressed!
[G-Merl walks toward him]
Demon God Demigra: But you still don't understand, do you? The future we offer is the only option for these humans.
G-Merl: I've heared just about enough of you're evil plans! You're boring us to death, Villains! You creeps are going down!
Master Xehanort: [Laughs] Such bravado for a little robot! I thought you were different from the rest... but maybe not. We are more alike than you think... the same blood runs through our veins.
G-Merl: This can't be... Ugg... [Clutches his head in pain as he falls down]
Emerl: G-Merl! What's wrong!?
G-Merl: Just... who are YOU?
Black Doom: Don't you know? You were created from my blood...
Black Doom: That's right... You are a part of me... do you feel that? I can control you... You can cannot escape me... nor can you escape your past! Hahahahaha...
Goku: Damn you!
Emerl: NO, it's not true!
Yoshi: You monsters!
[Onboard the Space Colony ARK. The Chaotix are hacking the ARK's database.]
Charmy: Espio...are you in yet??
Vector: [Pushes Charmy away] Quiet, Charmy! Espio, we need you to focus 'cuz if we don't hurry all the data we recovered will be lost.
Espio: Easier said than done... who signed me up for this anyway?
Charmy: That's it... I'll do it... get out of the way!
Vector: Get back here you idiot!
[Charmy hits the computer very hard, causing it to work.]
Chaotix: Hey it's working!
[The computer shows a video of Professor Gerald Robotnik, back inside the Black Comet.]
Gerald (video): G-Merl, my friend.
Adagio Dazzle: What is this!
Gerald (video): If you're listening to this then the worst has happened... you need to know the truth. The government plans to shut down this research facility.
[Inside the headquarters of Guardian Units of Nations.]
Gerald (video): The government plans to cease all of our research... and imprison all who know about you. I made a terrible mistake, my friend. It's all my fault... making contact with that comet.
Commander: Professor Gerald...?
Gerald (video): Now, listen very carefully...
[Inside the Black Comet. Ash, DigiDestined and their Digimon, D-Team, Alpha Gang, Sonic and his friends are still paralyzed.]
Gerald (video): In 50 years, the Black Comet will return... they plan to harness it's powers to destroy this planet! The only way to stop them... was to develop a way to use the very power they intended to use against them.
Dr. Eggman: That's it! It's brilliant!
Gerald (video): G-Merl... it's up to you and you're fiends can stop them! I developed the Eclipse Cannon... It's the only weapon that can destroy that Black Comet. G-Merl, you are the only hope... to save mankind as we know it. The future of this planet depends on... YOU!
Donkey Kong: Wow...
[Maria entered the video.]
Maria: Don't worry, grandfather. G-Merl and his friends will protect this planet. Right, G-Merl?
Black Doom: Gerald.. you fool! [The videos disappeared on Black Doom's order] G-Merl is already in our control... What's this?!
[G-Merl stands up]
Demon God Demigra: Well, well, well... seems like you're immune to my mind control.
G-Merl: You have no control over me, Black Doom! I now understand why I am here... I made a promise and I'm here to keep it! Today, I put my past behind me!
Emerl: Team Robot! Attack them!
[As Team Robot leaps up to attack the Villains, they disappeared while leaving the Chaos Emeralds behind.]
Black Doom: Have it your way, G-Merl. So be it... be prepared to meet your maker! Your past, present and future ends here... TODAY! Prepare to die! Say goodbye G-Merl as you witness my true wrath!