Perhaps the Peter Cushing version of Dr Who and the Daleks when it was first shown on TV in the late '60s. It’s pretty weak - toned down to get a ‘U’ cert - and not a patch on Daleks Invasion Earth 2150 A.D. from the following year. When I saw that one, I recall that I was drawing scenes from it for some time afterwards. I don’t recall that from the first one though.