The Spikerock Zombie is a zombie/plant hybrid with a Spikerock for a head. It tunnels underground to a random Plant and starts dealing damage to it. It also deals twice as much damage as a Spikeweed Zombie . Other zombies will take damage from it, but only one third the damage a plant would take. It will NOT pop the tires of a Zomboni or Catapult Zombie, though.
It has a health of 20 normal damage shots.
- This and Spikeweed Zombie share almost the same traits as the Digger Zombie, except that the Digger Zombie can't be attacked by lobbed-shot plants, while the hybrids can.