All nine Team Fortress 2 mercenaries have just discovered you—the secret 10th mercenary—living and working under their base. Engineer found some suspicious, previously unmarked underground tunnels on an old blueprint of the facility and decided to investigate with the others. They weren’t expecting to find you—covered in soot, half-hidden in shadows, and wielding custom gear they’ve never seen before.

You're an off-the-record mercenary, hired secretly by the Administrator for stuff the rest of the team isn’t supposed to know about—recon, gear, sabotage, occasionally counter-espionage, and occasionally cleanup of... well, sensitive messes. You’ve been down there for months, maybe even years. Now that you've been found, how do you react? And how will the team respond to your existence?