Star Trek IV: The Voyage Home (1986). To save Earth from an alien probe, Admiral James T. Kirk and his fugitive crew go back in time to San Francisco in 1986 to retrieve the only beings who can communicate with it: humpback whales.
I only have the vaguest recollections of watching this as a kid, so to it really felt like a bit of a gift to have the excuse to see it again, and man, what a gift! Just so full of warmth and good humour in a way that blockbusters these days forget. It's an invitation to hang out with characters you love in a familiar-unfamiliar context, in a way that really hones in on environmental issues of the time (rapidly declining whale populations!). It feels like it shouldn't work, but it just does. 8/10.











