Any one map scenario with Axis troops makes a good Zombie scenario.
All inf, grenadier, and schutztruppen infantry are zombie troopers, as are their assigned officers.
Zombie infantry does not disorganize or demoralize as a combat result. A combat result that disorders places one hit (use a mine 1 counter) on the zombies. A demoralizing result places 2 hits on the zombie platoon (place a mine 2 counter). Three hits on a zombie counter causes them to dissipate, like a bursting bubble. Zombies continue to attack per their leader's activation rolls regardless of hits.
On the direct fire table zombie attacks are resolved with an additional -1 modifier (their eye-socket to brain coordination leaves much to be desired).
Zombie leader counters (called Necromancers) can add their combat or morale bonuses, whichever is higher, to assault roles for platoons they accompany. They increase the brain-lust of their troops.
Defending Commonwealth, U.S., and U.S.S.R. counters do not get any combat benefits from their activating leaders in direct fire, but do get morale bonuses from them in overcoming morale checks during direct fire. In assault, its every man for himself.
Try this variant on any convenient Friday the 13th, or on Halloween.