The film was produced and distributed by Venu Ravichandran under his production banner, Aascar Films.

The film stars Vikram and Amy Jackson in the lead roles along with Suresh Gopi , Upen Patel and Santhanam in supporting roles.

P. C. Sreeram was the film's cinematographer, editing was done by Anthony.

The film's original songs and background score was composed by A. R. Rahman.

Weta Workshop worked on the digital make-up and background arts for the film.

Yuen Woo-ping was announced for stunt direction with additional stunt direction and supervision by Anal Arasu.

Indian film production designer T. Muthuraj as the film's art director.

In May 2012, Shankar had visited New Zealand and met filmmaker Richard Taylor & Peter Jackson's special effects and prop company Weta Workshop.

Actor Vikram was provided with a catchy makeup by Sean Foot and Davina Lamont. Additional prosthetic makeup was done by Hollywood's Christien Tinsley and Dominie Till.

The film was earlier reported to be titled as Thendral or Therdal, but it was later confirmed that the project would be titled I.

The producer screened a 50 second sneak preview teaser and a song "Ennodu Nee Irundhaal" for the critics in late August 2014.