It revolves around a farmer who, in his quest to avenge his sister's death, becomes a dacoit bent on revenge.

Velu, a poor farmer, loses his sister Dhanam due to the atrocities and exploitation of landlord Periyaraja.

The gang is initially perturbed by Velu's presence, but his courage and good nature wins him their love and respect.

In January 1970, several months after the release of his first film as a producer (Pennai Vazha Vidungal, August 1969), M. Karnan began pre-production on his directorial debut, Kalam Vellum.

[6] The Indian Express called it a "hotchpotch of all the adventure films that have come in Tamil and English movies that have been imported".