Revolt Of The Zombies. 1936.
An expedition is sent to Cambodia to stop a serum being used that can turn people into zombies.
This seemed to have something good going for it, set during WWI, someone has developed a mind controlling serum and puts it towards what they think is good use. It did have some mild adventure, but half way through/towards the end it fizzles out more into a drama, romance that changed the tone of the film and become less interesting for me.
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