The Twins Effect (traditional Chinese: ), also known as The Vampire Effect in the United States, is a 2003 Hong Kong film directed by Dante Lam. The movie was derived from the famous Cantopop duo, Twins, starring both Gillian Chung and Charlene Choi, and co-starring actors Edison Chen and Ekin Cheng, with a special guest appearance by Jackie Chan.
Following its release on June 23, 2003, The Twins Effect was a box-office success in Hong Kong. The film gained huge popularity, mainly from fans of the musical group, Twins.
