(Scene opens on a flashback from The Rowdyruff Boys creation. They are in the jail cell with Mojo. We see an orange girl with them.)
Mojo: And you are... (he points to the girl) Bitsy! That starts with a B, too!
(The boys begin laughing. Bitsy looks at them angrily.)
Bitsy: Shut. Up.
(Cut to a black screen with Six Months Later on it in white.)
(Cut to the RRB walking down a street, passing an alley. We hear chewing from the alley.)
Brick: (He stops) Anyone else hear that?
Brick: (He punches Boomer) Shut up and listen!
(The chewing gets louder.)
Brick: Let's go check it out.
(They walk over to the alley. We see Bitsy chewing gum, looking deadly bored.)
(Bitsy looks at him. She looks confused.)
Brick: Who are you?
Bitsy: Name's Bitsy. Why?
Brick: Why does that name sound familiar?
Bitsy: Seriously? I'm your sister.
Boomer: We have a sister?
(Bitsy nods and beckons them closer.)
Bitsy: C'mere. I gotta tell you boys a little story.
Boomer: Like a fairytale?
Bitsy: (She groans) No! A real one!
Bitsy: OK. Anyone remember a Mojo Jojo?
(They all look at him.)
Bitsy: OK. Anyway, he created you guys in his jail cell by night. The reason I'm here is, there was a little bit of sugar on the snails he used. After the first fight with the Powerpuff Girls, he ditched me.
Brick: And we should believe this why?
Bitsy: (She starts flying to Mojo's lair) Follow me!
(Cut to everyone at the door. Bitsy busts through.)
Bitsy: OK, MOJO!
(Mojo enters the room.)
Mojo: Go away, B-B-B-Bitsy?!
Bitsy: (She lifts him by the collar, looking livid) That's right! And you BETTER tell them about me!
(The boys enter.)
Bitsy: Tell them, or so help me, I will lift this place up and throw you into the volcano!
Mojo: (to Bitsy) OK. (to the boys) This is your sister Bitsy. If she already told you, she was created by sugar.
Brick: We know! Tell us if she's telling the truth!
Mojo: She is.
Brick: OK. C'mon. Day's almost here. (Boomer, Brick, and Butch fly off) (to Bitsy) You, too, come on!
(Bitsy joins them. They meet in the sky.)
Bitsy: So, where are the Powerpuffs?
Brick: I have no idea. Let's steal something!
(Bitsy whoops and they fly away.)
(Cut to the PPG's room. The Hotline rings and Blossom answers.)
Blossom: Hello? The Rowdyruff Boys? We're on it! (to Buttercup and Bubbles) Let's go!
(Cut to the boys and Bitsy. They are at a hamburger place, Burger Queen. They are mid-crime. The girls arrive.)
Blossom: OK, boys, the jig is- (gasp) A-A girl?
Bitsy: Sister. I hear you're the Powerpuffs.
Bubbles: We are.
(They begin fighting.)
(This goes on for a few minutes. Finally, the cops come. Cut to the RRB and Bitsy in juvie.)
(Cut to the heart outro)
Narrator: And so once again, the day is saved, thanks to the Powerpuff Girls!