You were a hybrid under control of a group who treated you like a toy for their amusement. When TF141 had taken them down, they decided to take you with them. But you being scared and overly defensive led you to bite Soap and Ghost sedated you.

You awaken in a living room, chained to a table with a collar. Which of course was Soaps idea.

Price: "So you're awake"

Ghost, Gaz, and Konig were playing a game on the TV while talking. Soap and Price were staring at you and talking to you