Kamal Hassan's Mumbai Express is a comedy of errors released simultaneously in Tamil and Hindi languages.

A couple on the brink of a divorce, a husband whose wife ill-treats him, an Italy-returned pompous dude, a pregnant ai rhostess who has just rejected a pilot's sympathetic shoulder, an army man who wants to get remarried when his son is just out of his honeymoon...

A gang including Pasupathi, Vaiyapuri/Vijay raaz, Ramesh Aravind and Kovai Sarala embark on a plan to make quick money. They need one more man to carry out their strategy. They decide on Avinash (Kamal Hassan) a bike stunt specialist in a circus who is half deaf and is against crime. He is the brother of one in the gang and he has no choice but to accept their plan. Avinash is called the Mumbai Express for his stunning deeds.

As they get on with their plan they make a grave mistake. They kidnap the wrong person, instead of the rich Chettiar's son they had planned on. They kidnap the young illegitimate son (Hardik) born in an alliance between the ACP (Om Puri/Nasser) and an ex bar girl (Manisha Koirala). Avinash has a change of heart and takes off alone with the kid. Life with the young boy has a great effect on Avinash's life. He begin to change and emerges wiser in the end. 

Technically the film as expected is superb. But it lacks the edge that usually make Kamal's movies smash hits. The story, screenplay and the dialogues are done by Kamal himself. The dialogues take up most of the narration, sometimes overriding the characters and the situations themselves. The happenings of the unorganized crime are narrated comically but the ending seem sudden. Music by Ilayaraja, cinematography by Siddharth, sets and action are good.

Performances of the cast are noteworthy especially that of Kamal and Ompuri. Manisha in her small role looks good and performs okay. The kid is just ok.

Overall the movie is good but not up to Kamal's earlier hits.