Set in the interiors of Uttar Pradesh against a political backdrop, Omkara is the story of a powerful warrior, who lets his blind passion and unfounded jealousy destroy his and other's lives.

Omkara (Ajay Devgan) is the chief commander of a gang, and Langda Tyagi (Saif Ali Khan) and Kesu (Vivek Oberoi) are his chief accomplices. This gang indulges in criminal activities and sustains themselves.

Although they are criminals, they follow a code of complete loyalty and honesty amongst themselves. One day Omi decides to appoint a lieutenant, and everybody knows that it will be one of his two right hand men, Tyagi or Kesu.

However all hell breaks loose when Omi appoints the brave warrior Kesu, instead of Langda. He is spewing venom from within, but manages to maintain a calm and noble outward appearance. Langda vows to take revenge on Kesu.

He finally gets the opportunity and an evil plot takes shape in the wicked Langda's mind. Langda decides to use the love of Omi's life, Dolly (Kareena Kapoor) as a pawn in his sinister plan. He implicates Dolly and Kesu of having an affair, behind Omi's back.

Tyagi is a crafty, wicked liar, he has the ability to lie in the most convincing way and it is this quality that he uses to convince Omi of Kesu and Dolly's betrayal.

Tyagi takes the help of his wife Indu (Konkona Sen) and another accomplice, Raju to carry out his evil deed which will see the destruction of Kesu. But Dolly is besotted with her beau and Kesu is unflinchingly loyal to his chief in command and will always stand by his side.

But the seeds of jealousy have already been sowed in Omi's mind and his pride has been hurt and his heart has been broken.

And hell hath no fury like a lover who is scorned and so Omi with his own hands manages to destroy his love and loved ones.

But within the ruins of love, there is something more to come?

Will there be a silver lining for the doomed Omi or will the black clouds envelop him?