The Darkest Nights) is a 1967 Indian Malayalam-language science fiction thriller film directed by P. Subramaniam under the name Mahesh.

[1] An adaptation of the 1886 novella Strange Case of Dr Jekyll and Mr Hyde by Robert Louis Stevenson, it was the first science fiction film in the history of Malayalam cinema.

After reading his uncle's diary, Santhan realises that other voracious directors of the bank are responsible for his death.

Vimala's cousin Mohan is in love with Vilasini, a night club dancer.

Karutha Rathrikal, adapted from the novella Strange Case of Dr Jekyll and Mr Hyde by Robert Louis Stevenson, was the first science fiction film in Malayalam cinema.