He has starred in web series such as Special Ops, Farzi, The Railway Men and Citadel: Honey Bunny.
He was praised for his role as a young Prime Minister in the Zee TV series Pradhan Mantri (2001), directed by Ketan Mehta.
In The Hindu, Sevanti Ninan wrote, "an actor to watch: Kay Kay Menon ... this unusually tall actor who plays the pradhan mantri is a major saving grace"[4] while in The Tribune, Amita Malik commented, "excellent acting by Menon, who skilfully conveys the physical as well as mental image of the honest politician".
Meanwhile, his commercial films Deewar (starring Amitabh Bachchan) and Silsiilay (with Shahrukh Khan) flopped at the box office.
It was only in 2005, with the eventual release of the critically acclaimed Hazaaron Khwaishein Aisi, but with Ram Gopal Varma's Sarkar, Menon had his break.
He impressed and gained more popularity with a role as Himmat Singh in 2020's Special Ops - a web series for Hotstar.
The Dark Side of Life: Mumbai City 16(The Assassin), 18(On the Run), 42(Breaking News), 68(Friends), 104(Beyond Truth) James Mathew Aakash(Serial Killer)