In a near-future society where technology and crime intertwine, I Am Kathalan follows Vishnu (Naslen K. Gafoor), a skilled cyber investigator haunted by his past. As he delves into a series of high-profile cyber crimes that threaten to destabilize the city, he discovers a sinister conspiracy led by an elusive hacker known only as "Kathalan."

Teaming up with his resourceful partner Simi (Lijomol Jose), they must navigate a web of deceit and danger while confronting their own demons. As they get closer to uncovering the truth, Vishnu finds himself questioning the very nature of justice and morality in a digital age.