Call me bad at GMing Paranoia, but I'm not enjoying jerking you around like this anymore.
Mayfair tries to enter the R&D lab, but his feet won't let him. Instead, they (doubtless conspiring with his legs) turn him in a random direction and have him start running. Five walls and countless hapless citizens later, he interrupts the peace and quiet of the briefing room by crashing through a wall.
"'Sabout time. Let's begin."
Bright lights flash on around the room. It's wide and shallow, with a high bench where a citizen in indigo and a citizen in yellow. A citizen in orange stands near them, and four Blue-clearance guards with garish outfits and...unique weapons stand at attention. An Indigo-clearance person in a similar uniform, presumably their leader, gestures impatiently for you to go into a wide, shallow, and narrow pit with a red line in it. Let's assume you do, because you all have a feeling he'd test that weapon on you if you didn't.
The Indigo citizen, who despite the lights manages to remain in shadow (remarkable how the lights work, must be to improve morale), speaks.
"Welcome, citizens, I know you're all very eager to Serve the ComputerTM, execute Commie mutant traitors, serve Alpha Complex, and all that. Luckily for you, I have such an opportunity for you.
"The Computer realizes, of course, that you are all inexperienced Troubleshooters. In its Finite Wisdom, it has selected you four for a mission which is simple, important, and simply important. In addition, we have selected a more experienced Troubleshooter to act as a guide, mentor, and leader on your first mission. He is not present currently; surely he was delayed by whatever delayed you. In any case, we are certain you will be able to complete the mission. Successfully."
He takes a moment to look each of you in the eyes for just a moment, but it feels like he's going through your mind as he does so.
"The mission will take you to...what sector, Citizens?"