In its category for Fewest actors in a narrative film, the Guinness Book of World Records begins the list with this:

“Excluding monologues, the only narrative films with a single cast member have been Yaadein (India, 1964), written, directed and produced by Sunil Dutt (India), who was also its only actor….”

(Only two other films are listed in this category; one is the 2002 French-American production Lettre; the other is the 2004 Kannada film Shanthi).

I have known about Yaadein for a long time now; it was aired on Doordarshan when I was a child, and I remember my parents watching it. I wasn’t allowed, because this is one of those rare Hindi films from that era which had an A certificate. I do recall, though, my parents telling me that it was a unique film, with only Sunil Dutt in it.