The story consists of two parts. The first part is in 12th century which is about 20 min. The second part is in the year 2004 which goes for about 2.2 hr. The history of first part repeats in some form in the second.
Part1: In this the story revolves around Lord Ranganatha.
Rangarajan Nambi who is a loyal disciple of Ramanuja Azhwar, tries to protect Lord Ranganatha.
King Kulothunga, a follower of Lord Siva, compels Nambi to change his religious beliefs and worship Lord Siva instead of Lord Vishnu but Nambi refuses. He punishes nambi which leaves a mark on his forehead. He then orders for the immersion of the statue of Lord Ranganatha along with Nambi into the sea. The king takes him along with Ranganatha on a boat to the sea shore, and drowns him along with Ranganatha into the sea.
Part2: In this also the story revolves around Lord Ranganatha. Govind, an American scientist tries to protect bio weapon, which eventually goes into Idol, thus he indirectly protecs Ranganatha . A scientist who is a collegue of Govind and follower of different thoughts asks him to change his mind but Govind refuses. For that Fletcher , a former CIA officer turned villain chases him, which leaves a same mark on the forehead of Govind. Fletcher then takes (chases) him to the sea shore, starting with a lorry, on which Govind accidently fells (clue: on the back side of it there is a symbol of lord hari and Ramnujan), then in a train and finally to the sea shore. He drowns govind along with bio weapon and Lord Ranganatha.
This relating of a past event to the current chaotic incidents also falls under Chaos theory.
Even we can relate Annachi to that of Lord Krishna.