The Twins Effect, also known as Vampire Effect in the United States, is a 2003 Hong Kong martial arts comedy-horror film directed by Dante Lam and Donnie Yen. The film was derived from Cantopop group Twins, starring both members Charlene Choi and Gillian Chung in the leading roles. Co-stars include Edison Chen and Ekin Cheng. Jackie Chan makes a cameo appearance as an ambulance driver.

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Quick Facts The Twins Effect, Traditional Chinese ...

The Twins Effect
Film poster
Traditional Chinese	千機變
Simplified Chinese	千机变
Hanyu Pinyin	Qiān Jī Biàn
Jyutping	Cin1 Gei1 Bin3
Directed by	Dante Lam Donnie Yen
Written by	Chan Hing-kar Jack Ng
Produced by	Cheung Shing-sheung
Starring	Charlene Choi Gillian Chung Ekin Cheng Edison Chen Anthony Wong Mandy Chiang Josie Ho Maggie Lau Jackie Chan Karen Mok Chapman To
Cinematography	Cheung Man-po
Edited by	Chan Kei-hop
Music by	Chan Kwong-wing
Production companies	Emperor Multimedia Group Goldpeak Corporation Limited
Distributed by	Columbia Tristar Home Entertainment
Release date	8 March 2003 (2003-03-08)
Running time	107 minutes
Country	Hong Kong
Language	Cantonese
Box office	$28,423,960 (Hong Kong)

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Released on 8 March 2003, The Twins Effect was a box-office success in Hong Kong, became the highest-grossing domestic film of the year. The film gained huge popularity, mainly from fans of the Cantopop group Twins.

An evil vampire duke seeks to kill and collect the blood of a royal family of European vampires in order to become all powerful. The last surviving member of the family, Prince Kazaf, flees to Hong Kong with his servant Prada. There, they are introduced by estate agent Momoko to live in an abandoned church.

Vampire hunter Reeve is depressed after his partner Lila is killed by vampires. He decides to train Lila's younger sister, Gypsy, to inherit her sister's duty and fight the vampire duke. However, Reeve's own sister, Helen, sees Gypsy as a rival.

At the same time, Kazaf meets Helen and falls in love with her, after which he intends to lead the life of a human being, but he is tracked down by the duke. Helen helps Kazaf and lets him hide in her home, where they are later discovered by Gypsy. Meanwhile, Reeve falls into the duke's trap while hunting vampires. Helen and Gypsy team up to save him.

After its release in Hong Kong, the film was renamed to Vampire Effect and some sequences were slightly altered. The new version was released in the United States in DVD as well.

The following are some differences between Vampire Effect and The Twins Effect:

• Several scenes and timelines in the opening sequence are altered
• Some scenes' editing are different
• Some dialogues were modified
• About 20 minutes of footage were cut from the original film, but some new scenes were added
• The new film length is shorter than the original version (88 minutes for Vampire Effect)
• Some film scores / music / instrumentals differ from the original version (different composer)

The Twins Effect was released in Hong Kong on 8 March 2003. In the Philippines, the film was released on 21 January 2004.^[1]

• The Twins Effect II
• Vampire film