Horror Express, also known as Pánico en el Transiberiano (Panic on the Trans-Siberian Express), is a 1972 Spanish-British horror film produced by Bernard Gordon and Gregorio Sacristan, directed by Eugenio Martín, that stars Christopher Lee, Peter Cushing, Alberto de Mendoza and Telly Savalas. It was written by Arnaud d'Usseau and Julian Zimet (credited as Julian Halevy). The film was loosely based on the 1938 science fiction novella "Who Goes There?" by John W. Campbell. (The novella was also the basis for three film adaptations titled The Thing).