|Appearance||Day of the Dead|
Bub was apparently in one branch of the United States Military before the zombie outbreak. When the undead apocalypse occurred, Bub died and reanimated. He was one of the zombie specimens captured by the Seminole Storage Facility from the zombie-infested caves.
Rather than dissect Bub like the other zombie specimens, Logan instead tries to and successfully domesticates Bub. He demonstrates this to Sarah and Rhodes by giving Bub several objects which the latter recognizes from when he was alive, and remembers how to use. Bub is also able to speak (albeit with some difficulty) by repeating what Logan says, and more importantly is able to interact with living humans without seeing them as food.
Eventually, Logan rewards Bub by feeding him the fresh remains of Miller and Johnson. Later, Bub is able to figure out how to remove his chain and discovers Logan dead in the freezer where he eagerly shows the man that he removed the chain only to realize he has been killed. Enraged at his mentor's death, Bub takes a discarded gun and goes on a rampage in the complex, attacking Steel and shooting Rhodes.
Bub chases Rhodes through the complex, shooting him several times, until Rhodes runs into a horde of zombies. Bub gives Rhodes a mocking salute as the latter is dismembered and eaten alive by the zombie hordes.
- Bub is the third zombie in the series seen carrying a gun; The first was the zombie who took Roger DiMarco's assault rifle, and the second was the undead Stephen Andrews.
- Bub is also the first zombie in the series seen aiming and firing a gun.
- Much like Big Daddy, Bub is never seen attacking a living human for food, and thus only kills the main human antagonist as an act of revenge. Bub did, however, consume the butcherd flesh and organs of the recently deceased Pvt. Johnson and Pvt. Miller given to him by Dr. Logan, implying he has not entirely lost his taste for human flesh.
- Dr. Logan stated that he named Bub after the former's father.