The Thompson can be bought off the wall, obtained by the Mystery Box, and Console Commands. It has a relatively high rate of fire, low to moderate recoil, and high power. It is a very good weapon to use, as ammo is just on the wall for 600 points, while headshots rack up points and kills easily. This can be used flawlessly to about round 20 without being Pack-a-Punched.
The Pack-a-Punched Thompson becomes the "Gibs-o-Matic," possessing more ammunition per magazine, more held ammunition, a higher rate of fire, and more power. Due to the high health of zombies in the later rounds, players may run out of ammunition during the middle of a round even if going for headshots. The Thompson lasts up to about round 25 to 28.