The hall widened into dead end a room with several small doors.
"Welcome home #7251. We've been waiting on your return."
A disembodied voice sounded through hidden speakers.
It sounded strict and robotic. Unmistakably human, yet unnaturally rigid.
"If you are quite ready we'll begin with the first few tests. We'd like to see how much you've grown since our lasts measurements."
A few small doors opened and rows of wheeled cages with laboratory rats rolled out. All neatly labeled with their number, health status, various medication like antibiotics given, etc.

"We'd like you to find some creative ways to infect and incapacitate these subjects. Note that some are out of your reach, you'll need to effect through other subjects."