In Brikpocalypse, dead zombies rolled 1D6 at the end of each turn and were resurrected on a 5+; however, if they failed three consecutive rolls they became permanently dead. They could also be permanently killed by flamethrowers and chainsaws.
In Brikpocalypse, the only way of spreading the zombie infection was via their Hero, who could use a Stupendous Feat to zombify minifigs. However, zombies could eat the brains of dead troops to gain their skills (zombies started out unable to use ranged weapons or control vehicles). The reason I limited them this way is because the zombies already had the largest number of minifigs. In the future, I think I'll make zombies able to bring dead troops back to life as Zombie Minions.
Just one random act of violence can brighten your day. Especially if it involves explosives.