Just when the tourist bus to Goa is leaving Bombay Central, Mala - Aroona Irani comes running and boards it. Her entry is greeted with many admiring glances, as it was not often that such a beautiful girl took this bus and that too, alone. Aruna may have been alone on the bus, but those who are vitally interested in her movements have momentarily been left behind. The evil Shatrughan - Shatrughan Sinha and his cronies follow in their car. They are after Mala because she has witnessed them committing a murder. Meanwhile, young Ravi - Amitabh Bachchan has already sensed the danger that is lurking on the road from Bombay to Goa and catches the bus midway.
From hereon, begins the laughride. Goa is 616 kms. from Bombay and when you travel in a bus with Mahmood as the conductor, the journey can only be filled with thrills, chills, belly-laughs, and, for good measure, a delightful romance between Mala and Ravi. So, don't miss this bus. It is ready to take you on the most enjoyable journey of your life.