(At Hiden Intelligence, The heroes are shocked to see Osaka being conquered by Kamen Rider Corona, and Percy gets angry about it.)

Percy: That damn bitch... I'll make her pay for this!

(Percy then rushes as he transforms into Kamen Rider Birthright and flies towards Osaka.)

(Cut to Osaka, Azu is seen approaching Corona.)

Azu: Your stepson is approaching here.

(Corona turns to see the Black Dragon Ranger walking away.)

Black Dragon Ranger: I'll stop him!

(Then Black Dragon Ranger summons his Mega Black Dragonzord and jumps inside of it.)

(Back to Birthright, he is seen flying towards Osaka.)

Birthright: I must hurry!

(Out of a sudden, a hand catches him as he sees the Mega Black Dragonzord.)

Black Dragon Ranger: (over voice) Well, well, well, look what we have here... a Reiwa-type Skyrider. What brings you here, my future son-in-law?

Birthright: You... (grunts) are not... (struggles) my father!

(Birthright gathers his strength to break free from Mega Black Dragonzord, but the evil Ranger notices that and squeezes him.)

Birthright: AAARRRGGGHHH!

Black Dragon Ranger: It doesn't matter. Nancy won't need you anymore.

(As the Mega Black Dragonzord prepares to squeeze the life out of Birthright, a voice is heard.)

????: SENKI CHANGE!

ULTRAMAN Z!

(Ultraman Z comes in and kicks the Mega Black Dragonzord.)

Rainbow Ranger (Ultraman Z): You're fighting me now, Black Dragon Ranger!

Black Dragon Ranger: So you can now change into other Megaforce Heroes, huh? Well, it doesn't matter. You will die soon!

Rainbow Ranger (Ultraman Z): Don't count on it!

(Rainbow Ranger (Ultraman Z) kicks Mega Black Dragonzord, and then he dodges one of the mecha's attack before punching his chest multiple times, and then he punches his face, bringing the mecha down. Meanwhile Birthright gets up and flies as he prepares his finisher.)

EAGLE KICK!

(Mega Black Dragonzord gets up and Black Dragon Ranger prepares its finisher.)

Black Dragon Ranger: ENERGY SHOCKWAVE!

(Rainbow Ranger (Ultraman Z) prepares his finisher as well.)

Rainbow Ranger (Ultraman Z): ZESTIUM BEAM!

(Then both beams collide as none of them is having advantage, but then Birthright kicks through the mecha, and the Zestium Beam hits the Mega Black Dragonzord, destroying the mecha. As for the Black Dragon Ranger, he falls down after getting hit by Birthright's Eagle Kick as he slowly gets up.)

Black Dragon Ranger: It can't be... (sees Birthright descending) Curse you! 

(He suddenly sees electricity in his body.)

Black Dragon Ranger: No! It can't be! 

(He screams in pain as he explodes, and then Rainbow Ranger reverts to his normal form.)

Rainbow Ranger: Thank you for the help.

Birthright: You're welcome. Now, come on. We have to stop your mother.

????: Not so fast!

(A dimensional gap opens up, and then Dark Primordial comes in along with Azu.)

D. Primordial: You shall not interfere with my dear Nancy's plans.

Azu: Soon, Ark's will shall be done!

(She then places her own version of Zero-One Driver in her waist.)

ZERO-ONE DRIVER!

(She pulls out her Ark-Zero-One Progrisekey as Ark merges with her.)

ARK-ZERO-ONE!

Ark: Henshin!

PROGRISE! FINAL CONCLUSION! ARK RISING HOPPER! A JUMP TO THE SKY TO GAIN HATRED!

(Azu becomes Kamen Rider Ark-Zero-One.)

Ark-Zero-One: There's no one who can stop us. No one!

(Birthright and Rainbow Ranger get in their fighting stances as the screen fades out.)

(To be continued)