Guts (102)

[GateWorld]

THE WALKING DEAD - SEASON ONE GUTS EPISODE NUMBER - 102 Rick receives some surprise help escaping from a tank surrounded by walkers, and hooks up with a resourceful survivor who leads him to other humans holed up in a downtown department store. The group is none-too-pleased with Rick, whose gunshots have attracted a rapacious rabble of zombies, and he is forced to come up with a gutsy plan to get them out of the city. (TV Guide) VISIT THE EPISODE GUIDE >>

[Steelbox]

The part about distinguishing dead from living trough smell is actually plausible. Many don't have eyes, others have only half of the face, and the neurosensorius olfactorius are always pretty safe from damage in the inside of the head.