Your Motivation: You've got babies to make! If only these humans would be more cooperative. Instead of shooting you, they should let your young ones attach themselves to their faces and lay eggs in their throats. Then, when the baby alien is ready, it'll just pop out of the human's chest and grow up to protect the queen. For some reason, though, humans don't like the whole dying part.
Key Characteristics: Elongated head, double mouth, long tail, in desperate need of a drool cup.
Typical Dialogue: Lots of hissing and spitting.
How to Achieve the Look*: Allow an alien to impregnate you; make sure it buys you dinner first.
The Easy Way Out:
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*For macabre entertainment purposes only. Do not try this at home.