Gamma Energy visits the Aperture Science East facility, built after GLaDOS gained sentience. The goal was to create a facility where GLaDOS' research could be examined and tested without harm to employees or other people who actually... mattered, without her knowledge. Pick up a prototype Portal Device and try not to die.
It's always nice to have a friend to help you solve a puzzle.
looks hard
Oh cool, I see whats going on. Looks epic!
I bit the Companion Cube has some kind of secret behind it. Perhaps it isn't a weighted storage cube, but something else. And when GLaDOS warns you not to speak to it, or listen to it, I get suspicious.
Perhaps it is a non-weighted storage cube that has a personality core inside of it, but it was sealed closed. It would make more sense. Perhaps it is designed to contain every human emotion, and was built as a back-up in case the first four Personality Cores were destroyed, that is probably why GLaDOS made YOU destroy it.