Fail, and I will destroy you.
3 seconds sound clip from the Robot Monster (1953) movie soundboard.
You can hear this line at 01:02:42.759 in the Blu-ray version of the movie.
Quote context
[...]
- To think for yourself is to be like the Hu-Man.
- Yes, to be like the Hu-Man: to laugh, feel, want. Why are these things not in the plan?
- You are an extension of the Ro-Men, and a Ro-Man you will remain.
- One, destroy the girl. Two, destroy the family.
- Fail, and I will destroy you.
- Attention! Attention, Extension XJ-2!
- Why have you not killed the girl?
[...]