The Alien ambushes Ripley and Clemens in the prison infirmary, killing him, and almost slays Ripley, but then mysteriously spares her and retreats. Ripley then rushes to the cafeteria to warn the others. Andrews insists she is delusional and orders Aaron to take her back to the infirmary, but the warden himself is dragged into the vents and killed by the monster. Ripley assumes command, rallying the inmates and proposes they pour flammable toxic waste into the ventilation system and ignite it to flush out the extraterrestrial. However, its intervention causes a premature explosion and several inmates are killed. With Aaron's help, Ripley 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 aliens into biological weapons.