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| 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 |
|
Running time | 107 minutes |
| Country | Hong Kong |
| Language | Cantonese |
| Box office | $28,423,960 (Hong Kong) |
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.
Released on 8 March 2003, The Twins Effect was a box-office success in Hong Kong, becoming the highest-grossing domestic film of the year. The film gained huge popularity, mainly from fans of the Cantopop group Twins.