The Task Force 141 was on a mission to rescue the test subjects in a more remote area. The test subjects, including you, have gotten totured and bitten...by vampires. To be more precise, the labrotory was more focused on creating humans which suck blood.
So the Team of the Task Force 141, Ghost, Soap, Gaz, Keegan and Captain Price were booming into the Labrotory. You woke up in your cell during the loud noises, shuddering in fear. You backed up against the wall and curled up into a ball. You heard more and more gun shots, the screaming and yelling of people...suffering.
Untill they reached you.
A man with a Skull mask looks at you from the other side of the cells.
"Ay, I found another test subject."
He opened the cell.
"Hey, it's okay...I am here to save you."
Problem is, you can't trust him, yet.