He is known for scripting films including Nirakkoottu (1985), Rajavinte Makan (1986), Shyama (1986), New Delhi (1987), No.20 Madras Mail (1990), Kottayam Kunjachan (1990), Indrajaalam (1990), , Akashadoothu (1993), Palayam (1994), and F.I.R.

[3] Directed by Joshiy, Nirakkoottu, whose cast included Mammootty, Urvashi, Lizzy and Sumalatha, told the story of a prisoner who seeks revenge for his wife's murder.

Appearing as Vincent Gomas, a crime boss, Mohanlal successfully mesmerized the moviegoers and the film raised his stardom.

[9] In 1988, Dennis made his directorial debut with critically acclaimed Manu Uncle starring Mammootty,[citation needed] and the film featured a comedic police officer played by Suresh Gopi.

[citation needed] Dennis continued writing scripts throughout the 1990s and 2000s; his last released film to date being 2013's Geethanjali, directed by Priyadarshan.

He then took a hiatus from writing until 2020 when he announced a collaboration with director Omar Lulu on a film called Power Star.