Thelma & Louise, The Mexican, Seven and Interview with the Vampire. Which actor links these four films together?

Brad Pitt is the actor that appeared in all four films.

Thelma & Louise is a 1991 American road film directed by Ridley Scott and written by Callie Khouri. It stars Geena Davis as Thelma and Susan Sarandon as Louise, two friends who embark on a road trip with disastrous consequences. The supporting cast include Harvey Keitel, Michael Madsen, and Brad Pitt, whose career was launched by the film.

Interview with the Vampire is a 1994 American drama horror film directed by Neil Jordan, based on the 1976 novel Interview with the Vampire by Anne Rice, and starring Tom Cruise and Brad Pitt.

Seven (sometimes stylized as SE7EN) is a 1995 American neo-noir crime thriller film directed by David Fincher and starring Brad Pitt, Morgan Freeman, Gwyneth Paltrow, John C. McGinley, R. Lee Ermey, and Kevin Spacey.

The Mexican is a 2001 American comedy film directed by Gore Verbinski and starring Brad Pitt and Julia Roberts, with a plot that is a mixture of romantic comedy, adventure and road movie.