Banish 1 Zombie monster on the field, then Special Summon 1 Zombie monster from the GY of the player who controlled it, to their field, in Defense Position. If this card is in your GY: You can shuffle 1 of your banished Zombie monsters into the Deck, and if you do, Set this card, but banish it when it leaves the field. You can only use each effect of "Return of the Zombies" once per turn.