When they're defeated, walk through the newly opened doorway and look for some computers at the top of the stairs you find.

You can also lob your infinite supply of grenades at them as you camp out by the ammo crate. Fight off the robots that come after you by using the shrink ray to your advantage. Next, there are some supplies in the doorway underneath Dr. Walk left as soon as you get inside the next room and look in a smaller room for a shrink ray. Proton until he leaves, then walk past two more doors to end the chapter. Get an (03/19) Ego Boost by drinking the beer on the table, then get another (04/19) Ego Boost after tapping the keyboard on one of the computers. You'll find yourself by the computers in the center of the bio scans. Walk up a tentacle to an open vent once the area is clear. If you're low on health, try to keep their explosions away from you.

A few colorful exploding orbs will burst out at the end. This will take you to an ambush hosted by pregnaders and octababies. After some octababies mess everything up, backtrack through lots of lasers and get down into a tunnel. Walk out the next door and the chapter ends. If you have the expander achievement, replace it with the ripper an EDF soldier was carrying. Look on a desk immediately to your left and read it to get an (02/19) Ego Boost. You'll find lots of scientists on the floor here.