Film, Theatre, and Media

The question lacks context about which 'Mithun' it refers to and what timeframe 'blockbuster' indicates. Assuming Mithun Chakraborty, 'Jimmy' (1985) was one of his successful films, but calling it his 'blockbuster' among options like 'Cheetah', 'Maa Kasam', and 'Baap Kasam' is debatable. The question is poorly structured.

Leela Chitnis became the first Indian actress to endorse Lux soap in the 1930s, breaking barriers in Indian advertising. Devika Rani, Madhubala, and Meena Kumari were legendary actresses but came later in the campaign's timeline.

Amitabh Bachchan made his acting debut in 1969 with 'Saat Hindustani,' directed by Khwaja Ahmad Abbas. This film launched his legendary Bollywood career spanning five decades.

Kajol's actual debut film was 'Bekhudi' (1992), though 'Baazigar' (1993) is often mistakenly cited as her first film as it was her breakthrough role. Bekhudi was released before Baazigar, making it chronologically her first movie.

Ajay Devgn (credited as Ajay Devgan early in his career) made his debut with 'Phool Aur Kaante' in 1991. The film was a major success and launched his career. Jigar (1992), Dilwale (1994), and other films came after his debut.

Qayamat Se Qayamat Tak (1988) was Aamir Khan's debut film as a lead actor, where he starred opposite Juhi Chawla. It was a major commercial success and launched his career. Hum Hain Raahi Pyaar Ke (1993) came later in his career. Dil (1990) was his second film. Haal-e-dil is not an Aamir Khan film (it's a 2008 film with different actors). The question specifically asks for his first movie.

Lagaan (2001) was Aamir Khan's first film as a producer. He not only starred in it but also produced it under his banner Aamir Khan Productions. It was a landmark film that was India's official entry to the Oscars. Taare Zameen Par (2007) was his second production. Mangal Pandey (2005) and Ghazini (2008) were later films where he acted but didn't produce. The question specifically asks for his first production.

U Me Aur Hum (2008) was Ajay Devgn's (then Devgan) first film as director. He also starred in it alongside his wife Kajol. Raju Chacha (2000) and All The Best (2009) were films he acted in but didn't direct. Gangajal (2003) and Gangaajal 2 were directed by Prakash Jha. The question specifically asks for his directorial debut.

Kishore Kumar was the primary playback singer for Rajesh Khanna, singing many of his most iconic songs in films like 'Aradhana,' 'Amar Prem,' and 'Kati Patang.' Their collaboration produced numerous hits including 'Mere Sapno Ki Rani' and 'Roop Tera Mastana.' Mohammed Rafi also sang for Rajesh Khanna, but Kishore Kumar was most famously associated as his voice.

Will Smith was the original first choice for the role of Neo in 'The Matrix' but turned it down reportedly due to family obligations and other commitments. The role then went to Keanu Reeves, who made it iconic. Smith later mentioned he regretted turning down the role, though he chose to star in 'Wild Wild West' instead.

Rani Mukerji's Bollywood debut was 'Raja Ki Aayegi Baraat' (1997). While 'Ghulam' and 'Kuch Kuch Hota Hai' were her earlier successful films that established her career, they were not her first movie. 'Biyar Phool' appears to be a typo for 'Biyer Phool' (1996), which was actually her first film, but it was a Bengali film, not Bollywood. The question specifies Bollywood.