R.A.L.F.

R.A.L.F (also known as Robotic Assistant Labour Facilitator ) is a small robot who delivers mail and supplies around the NASA base. He is often accompanied by Carolyn McAdams and according to her he gets his deliveries mixed up once in a while.

He helps David get inside the hanger bay where the alien spaceship is being kept. He is last seen being loaded with mail by Carolyn.