Donovan's Brain (1953)

A scientist takes a the brain of dead man and revives it via electrodes as it lays suspended in a tank of liquid.

Lew Ayres

Bio:

https://en.wikipedia.org/wiki/Lew_Ayres

The Dark Mirror (1946)

A man is found murdered, with witnesses convinced about the woman they saw leaving his apartment, but it becomes apparent that the woman has a twin, and finding out which one is the killer seems impossible.

The amateur psychology doesn't hurt this well-staged and effective Noir thriller; and Olivia de Havilland in the double role of good sister/bad sister is a treat.

Halliwell**: "Unconvincing but highly absorbing thrilller with all credits plus; the best brand of Hollywood moonshine."