Red vs. Blue: In the PSA "Planning to Fail", the Red Team is quite prepared for zombies. Simmons has a supply of food stored in his attic in case of zombies and he won't tell Grif what he'll do after the food runs out in case Grif becomes one. Grif's plan is run to Alaska in the hope that any pursuing zombies freeze to death. Sarge however has thirty-seven zombie plans. 36 involve using Grif to distract zombies. For the 37th plan, he willingly becomes a zombie just to kill and eat Grif.
Tex shows herself to be this in Episode 18 and 19 of Revelations.