Best sci fi film ever for me has to be 12 Monkeys. Stands up to repeated viewing too. Bruce Willis' best role ever and Brad Pitt was a suitable nutcase. Madeleine Stowe was amazing especially as her preconceived ideas about the world she lived in started to fracture.
Even the mighty Blade Runner was knocked sideways by it in my book. But of course it is only IMO
My conviction is born to damn the fuckers who doubted me. To rise to great heights even beyond my own legend as a Great Cocksmith, Master Pintsman, and stunningly handsome Prince of Light in these dark Dark Ages!