The alien's hand thrusts out from behind the panel Ripley was using.

 

Horrified, Ripley is momentarily frozen, not knowing what to do next.

 

The stowaway opens and closes it's mouth in preparation for it's next victim.

 

Ripley runs and hides in a locker.

 
Through the window it watches the alien slowly move around.

 
It doesn't get up, it seems content to just lay there for a while.

 
Which gives Ripley time to think of something.

 
She puts on a space suit.

 
And loads a harpoon gun.

 
Before she comes out she checks to make sure the uninvited guest is staying put.

 
She emerges from the locker.

 
and straps herself into a chair.

 
She begins de-pressurising the cabin.

 
The alien finds it uncomfortable and starts to get up.

 
It removes itself from it's hiding place.

 
Ripley has to turn her back on it while she checks the pressure status lights.

 
The alien being stands.

 
Ripley sees the sixth light illuminate, and......

 
slowly turns her head to see where the alien is.

 
and gets a nasty surprise!