Phineas: Ah, such a beautiful day on the beach. (Buford is giving a nerd a wedgie in his swim trunks)
Buford: That'll teach you a lesson.
Phineas: Ouch. That's gotta hurt. (Ferb nods in agreement) Hey, where's Perry?
(Perry is shown is Phineas and Ferb's bedroom, he gets into the phone booth near Ferb's bed, takes out a bell and rings it three times, then the floor drops down, taking the bell with him, he falls into the lair, he looks to the screen, but finds that Major Monogram isn't there, cut to to Linda and Lawrence on the beach, Linda is seen drinking coconut milk)
Linda: I gotta say, I haven't felt this relaxed since our last wedding anniversary.
Lawrence: I agree. If only Love Handel was here... Oh, well, a man can dream, can't he?
Linda: I wonder how the kids are doing back home. (she picks up her cellphone and dials Candace, she hears it ring three times)
Candace(voice-over): Hello, you've reached the phone of Candace Flynn. If I'm not answering, it's probably because I'm trying to bust my bothers. Leave a message and I'll get back to you as soon as I can. (Linda hangs up)
Linda: I'm sure everything's fine.
(cut to Candace on the beach finding a seashell locket)
Candace: What is this? (she opens the locket, releasing a purple light, she gasps, she is blasted down, cut to Albert in the Du Bois house with Irving)
Albert: I told you, Irving. I'm in charge while mom and dad are in the Galapagos. (Irving sighs and walks away)
Irving: Worst week of summer vacation ever. (he goes outside and starts humming, while outside, he sees a ray of purple energy) What the heck is that?! (he sees purple energy throughout the sky, back to the beach, Candace is unconscious, fire and frost are shown spreading across the sand, several people gasp and start running away as Isabella arrives)
Isabella: Hey Phineas, what'cha... (she is the deserted beach) doin? (she gasps, seeing the spreading frost and fires on the beach)
Phineas: We gotta get out of here! (he grabs Isabella by the hand, they run away with Ferb, Jeremy, carrying Candace in his arms, escape as the sand turns to frost)
Isabella: I don't understand, what's happening?!
Jeremy: Whatever it is, it can't be good. (the power goes out)
(cut to Perry in his lair with Major Monogram there in person)
Major Monogram: Agent P, there is a lot of trouble going on. All of the beaches in Danville are shown having the coastal water and sand frozen, yet also fires on the beach. There's only one logical explanation for this; Dr. Doofenshmirtz. We believe that he has gone completely mad. We must go to his lair and stop him before he destroys the world. (cut to Doofenshmirtz Evil Inc building)
Chorus(singing): Doofenshmirtz Evil Incorporated!
(Dr. Doofenshmirtz is lounging about on a chair, Norm is sweeping the floor)
Dr. Doofenshmirtz: Everything is so peaceful. (a timer beeps)
Norm: I made cookies, boss. (he gets out a rack of chocolate chip cookies)
Dr. Doofenshmirtz: Ah, perfect. The folks at L.O.V.E M.U.F.F.I.N will enjoy these at the upcoming picnic. (Perry, Carl, and Major Monogram bust down the door) What the?! (he sees Major Monogram) Major Monogram?! (he looks at Carl) An intern?! (he looks at Perry) And Perry the Platypus! What are you doing here?
Major Monogram: Why, you should know!
Carl: You're the one responsible for all the frost and fire on the Danville Beaches! You're trying to destroy the world!
Dr. Doofenshmirtz: What?! That's crazy! I haven't done anything. You believe me, Perry the Platypus, right? Am I right? (Perry stares at him blankly)
Major Monogram: You're under arrest, Heinz Doofenshmirtz. (he gets out handcuffs, Dr. Doofenshmirtz steps back)
Dr. Doofenshmirtz: What? You can't arrest me, I haven't done anything wrong! (Norm sets down the tray of cookies)
Norm: All he did was make cookies for L.O.V.E M.U.F.F.I.N.
Dr. Doofenshmirtz: Not helping!
Carl: Get him! (they charge towards Dr. Doofenshmirtz)
(cut to Baljeet, who is meditating in his room)
Baljeet: I feel a disturbance in the universe. (his phone rings, he opens his eyes and answers it) Hello?
Phineas(voice): Baljeet, get Buford and come to the outside of Better Panda Restaurant immediately.
Baljeet: Why do...
Phineas(voice): Just do it!
Baljeet: Okay, okay, I'm on it! (he hangs up)
(cut to Phineas, Isabella, Ferb, Jeremy and an unconscious Candace at the front of Better Panda, Baljeet and Buford are running, they pant once they reach the entrance)
Baljeet: What's the emergency?
Isabella: Have you not seen the purple rays of light in the sky or the frost and fire on the beaches?
Baljeet: Oh... That's very very bad.
Meap(voice): Indeed it is. (they turn around to find Meap, wearing a red mustache)
Phineas: Meap! It's so nice to see you again!
Jeremy: Hey, I remember you.
Meap: No time to explain, get into my ship, and I'll explain on the way! (they all run into Meap's ship, and it takes off, Candace wakes up)
Candace: Oh, what happened?
Buford: That's what we're about to find out.
Meap: That purple light in the sky is an ancient curse created by a powerful sirenia.
Jeremy: What's a sirenia?
Meap: Your kind knows a mythological creatures called mermaids. Do you know where that legend came from? Sirenias, which are half-fish, half-human creatures. Unlike the mermaids of your stories, they can easily shift from human form to their true form, but it drains them of their energy. They also have powers.
Phineas: What kind of powers?
Meap: It varies. Usually sirenias have two powers, but in some rare cases, they can have three or more abilities. Like this one. The magic released in that purple seashell locket found on the beach had the powers of fire, ice, and light. A dangerous combination of elements and matter.
Candace: I'm going to regret asking this, but why is that bad?
Meap: Because the elements and light are very durable and long-lasting. I can tell because my energy sensor has been going off like crazy. The truly skilled sirenia can put their own life force into their powers, meaning as long as they live their powers will rage on and will spread throughout the planet. Meaning that Earth will eventually be destroyed in... three hours. (they all gasp)