Wally Mack is a resident of Vault 101 in Fallout 3. He is the son of Allen and Gloria Mack and the Grandson of Stanley Armstrong. He is also a member of the Tunnel Snakes along with Butch DeLoria and Paul Hannon Jr. His first appearance comes in the Growing Up Fast quest, he's a guest at the Lone Wanderer's tenth birthday party. He can also be seen during the Future Imperfect quest, him and the Tunnel Snakes are seen bullying Amata.
 Trouble on the Homefront
- Main Article: Trouble on the Homefront
During the quest, Wally can be found in your old bedroom. He says that he left the Tunnel Snakes and then goes on to insult your Father.