The Twins Effect, 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. The film was later released on DVD in the United States, where it was renamed The Vampire Effect.
