- "Who's Soap?"
- — Worm, referring to Captain MacTavish after Price and Soap reunite.
Worm was born in America and works for the U.S Navy SEALs. He has short black hair and is seen in a full body wetsuit with black face camouflage.
Worm participated in the assault of a Russian Gulag. He makes it to the bottom of the prison along with Roach and Soap and helps secure Prisoner #627, revealed to be Captain John Price. Upon Price referring to MacTavish by his nickname, he comments "Who's Soap?". Worm and the others escape the Gulag by hooking themselves to a helicopter's zip SPIE rig. He is dangerously close to death as a missile's explosion just nearly catches him as they are evacuated.
- Sometimes before the player breaches the last wall in "The Gulag", there are two soldiers with Soap and Roach. When the player breaches the wall and takes a hit from Price, the soldiers disappear and Worm appears in their place.