Merry Christmas is based on Frédéric Dard s French novel Le Monte-charge. Helmed by Sriram Raghavan, the thriller stars Katrina Kaif and Vijay Sethupathi in lead roles. The film has been shot in two languages, with different supporting casts. The Hindi version features Sanjay Kapoor, Vinay Pathak, Pratima Kannan, and Tinnu Anand.