Zombie picnic

Clarissa and Griff are exploring the universe when they encounter a planet capable of supporting life. All there scans, however, reveal no signs of life. So they decide to land and have a little picnic lunch before exploring the planet. Unfortunately for them they couldn't pick anything up on their scanners is because zombies aren't really alive. Nothing ruins a picnic like the undead rising out of the ground beneath you. Just ask Clarissa, she knows all about it...