Bachchan made his acting debut in 2000 with J. P. Dutta's war film "Refugee" which was the fifth highest grosser of the year, and followed it by starring in over a dozen films which were all critical and commercial failures. His first commercial successes came with the 2003 & 2004 action films Zameen, "Dhoom" and "Run", which changed his career prospects. Bachchan went on to earn critical appreciation for his performances in the dramas "Yuva" (2004), "Sarkar" (2005), and "Kabhi Alvida Naa Kehna" (2006), which won him three consecutive Filmfare Award for Best Supporting Actor, making him the second and only actor after Dilip Kumar to win 3 Filmfare awards consecutively. In 2007, he portrayed a character loosely based on Dhirubhai Ambani in Mani Ratnam's drama film "Guru", which earned him critical acclaim and a nomination for the Filmfare Award for Best Actor.