This box includes 24 berserker zombies and 6 additional spawn cards to include them into any Zombicide base game.
Sculpts of the zombies are from the Zombicde Season Two: Prison Outbreak, although three exclusive sculpts are included.
Zombie sculpt breakdown
15 Berserker Walkers (5 of a mix of 2 Box of Zombies only sculpts)
6 Berserker Runners
3 Berserker Fatties (2 of the Box of Zombies only sculpt)
Spawn cards (139-144) come with a higher density of Berserker zombies than Prison Outbreak's deck.