Robert Neville (Charlton Heston) was a scientist working on an experimental vaccine as society disintegrated and out of desperation injected himself. The vaccine was effective but far too late.
Now he lives a solitary hedonistic life, picking over the luxuries left behind in the city.
He is not the only survivor. A tiny number live with the infection, pale sickly people who hide by day and are led by the messianic Matthias (Anthony Zerbe) who wants to destroy all the trappings of the former world. Including Neville.
CW: it's a bit Blaxploitation in parts
This adaptation of "I am Legend" abandons most of the "he who fights monsters" bleakness of the book for an action movie "fight the baddies and cure the disease" storyline using the barest of the bones of it.
It looks great though and generally works in this new model. The Family, as Matthias' followers are called, are a bit ridiculous going around in hooded robes and as it draws to the end goes a bit off the rails als they flip-flop between a happy and a downbeat ending committing to neither.
A fun bit of 70s sci-fi 6/10.