Ripley totally loses it and slams Ash against the wall.

 

She's upset that the company puts so little value on the crew's safety and she takes it out on Ash.

 

He says nothing, he just backs into the corner looking puzzled.

 

Ripley leaves him and goes back to the communal area.

 
She calls Parker and Lambert on the com system, but gets no answer.

 
As she heads towards the door, it closes and locks.

 
Ash is standing behind her, expressionless.

 
She goes to another door, but the same thing happens.

 
White fluid trickles down the side of Ash's head, he still says nothing.

 
Ripley tells him to open the door.....

 
It looks like he tries to speak, his mouth moves but his lips don't open.  He looks at Ripley in a very strange way.

 
He reaches out and grabs her hair and pulls a handful out as she breaks away from him.

 
She tries to get away but.......

 
He grabs her and throws her against the wall.

 
He picks her up and throws her onto another one.

 
Ash stands over Ripley for a moment, he looks at her, and looks around.

 
She's in no condition to get up.

 
He rolls up a magazine that is lying nearby.

 
and tries to force it into her mouth.

 
Ripley tries to stop him but he is much too strong for her.  Ash makes unusual high pitched sounds.

 
Parker and Lambert arrive and try to free Ripley.

 
Ash grabs Parker and causes him great pain as he grasps his flesh.

 
Parker strikes Ash on the back of the neck with a heavy object.

 
He lets go of Ripley, Parker tells Lambert to look after her while Ash flails around like a madman, squirting more of the strange white fluid out of his mouth.

 
Parker can't work out what the hell has got into Ash.

 
Parker hits Ash in the face.

 
Ash's head nearly comes off!

 
The partly decapitated Ash falls to the floor with arms still waving.

 
"Jesus, It's a robot. Ash is a god-damn robot!"

 
Parker moves closer to examine Ash.

 
But gets too close, Ash attacks him and pins him to the floor.

 
He calls to Lambert to help him get "this thing" off of him.

 
She strikes the decisive blow.

 
Ash's body goes rigid as Lambert has obviously shut him down.

 
Ripley tries to re-activate Ash, she's hoping he knows a way to kill the alien.

 
His arms twitch as she makes the final connections.

 
He looks asleep.

 
Ripley asks "Ash can you hear me?".  When there is no reaction she slams her hands on the table and shouts "ASH!".  He jumps a little and his eyes open.

 
"Yes I can hear you"

 
Ripley asks about special order 937, Ash says "You read it, I thought it was clear".  He confirms that the alien must be returned to Earth at all costs, even the crew is expendable.

 
"That damn company.... What about our lives you son of a bitch?"

 
Ash repeats to Parker that the crew's lives are not important.  Ripley asks if he knows how to kill it.  He replies "You can't"

 
Parker thinks that is bullshit.

 
"You still don't understand what you are dealing with do you? - Perfect organism, It's structural perfection is matched only by it's hostility"

 
"You admire it" Lambert states.

 
"I admire it's purity... a survivor.... unclouded by conscience, remorse or delusions of morality."  Parker says he's heard enough of this and asks Ripley to pull the plug.

 
She leans over to do it, but Ash has one more thing to say.....

 
"I can't lie to you about your chances, but you have my sympathy".  Ripley deactivates Ash for the last time.

 
She decides it's time for Lambert's plan, they are going to blow up the ship and take their chances in the shuttle.

 
This time there's no argument and the three remaining crew go to prepare.

 
But before Parker leaves........

 
There's something he wants to do.

 
Fry Ash.