One thing's for sure
If they get off their planet, they're not going to have claws or spiked fingers.
There going to be humanoid with shoulders, elbows, wrists and hands with at least 2 opposable digits. They'll need to be physically proportionate to their planets gravity in order to manipulate natural resources.
The show I mentioned was called "Mice" and it was on the "Outer Limits", not the "Twilight Zone".