Sivan (/sivən/) is a 1999 Indian Tamil-language science fiction action film written and directed by Velu Prabhakaran.

[2][3] The film starts with a terrorist group entering in an Indian military ammunition depot based in Delhi.

In the context of the fight against terrorism, the Government suspects that the terrorist group is from Tamil Nadu.

That night, the terrorist leader threatens him over the phone, but Alex refuses to drop the case and vows to arrest him.

Soon, Alex suspects Jupiter, a wealthy philanthropist and respected man in the society, to be the leader of the terrorist group.

Sivan, assigned to Alex's former city, proceeds to efficiently rid the streets of crime.

Sivan finally discovers his true identity and goes to Jupiter's warehouse to kill all the terrorists.