R Madhavan has said he'll release his upcoming biopic-drama 'Rocketry: The Nambi Effect' "only in the theatres". "I don't care how long I've to wait," he added. Directed by Madhavan, it will also feature Shah Rukh Khan in a cameo role. The film, which is based on the life of ISRO scientist Nambi Narayanan, will also mark Madhavan's directorial debut.