"Don't feel bad, I went to watch a film, named 'Avengers', but didn't understand what is happening in the movie," Amitabh tweeted on Sunday.
'Avengers: Infinity War' features over a dozen superheroes, who come together to save the universe from their might opponent, Thanos.
The film has earned over Rs 200 crore in India itself.
It stars Robert Downey Jr, Josh Brolin, Chris Hemsworth, Chris Evans, Mark Ruffalo, Scarlett Johansson, Samuel L Jackson, Chris Pratt, Zoe Saldana, Bradley Cooper, Vin Diesel, Tom Holland, Benedict Cumberbatch, Paul Rudd and Tom Hiddleston.