The Alien surprises Ripley and Clemens in the prison infirmary and kills Clemens. It examines Ripley, but spares her and retreats. Andrews orders Aaron to take her back to the infirmary, but he is ambushed and killed by the Alien. Ripley rallies the inmates and proposes they pour flammable toxic waste into the ventilation system and ignite it to flush out the Alien. However, the Alien's intervention causes an explosion and several inmates are killed. With Aaron's help, Ripley, who has not been feeling well this whole time, scans herself using the escape pod's medical equipment and discovers the embryo of an Alien Queen growing inside her. She also discovers that Weyland-Yutani hopes to turn the Queen embryo and the adult Alien into biological weapon.