Dum Dum Dum is a full of love story. Madhvan, (Aditya) a city slicker's marriage is fixed by his dad in the village to Jyothika (Ganga), a village belle. He is not happy with it, as he wants to marry a city girl and that too after falling in love. On the other hand, Jyothika also is not interested, as she wants to marry only after completing her engineering in the city.
After a car wreck on the winding Mulholland Drive renders a woman amnesic, she and a perky Hollywood-hopeful search for clues and answers across Los Angeles in a twisting venture beyond dreams and reality.
When her scientist ex-boyfriend discovers a portal to travel through time -- and brings back a 19th-century nobleman named Leopold to prove it -- a skeptical Kate reluctantly takes responsibility for showing Leopold the 21st century.