Description: Travel to the space of nothing but plants, zombies, and you.
7 new plants
10 new zombies
4 new upgrades
World Gimmick: Every 30 seconds, a random plant anywhere on the lawn will float into the empty abyss of Outer Space, making you lose a plant.
Astro-nut: A stronger Wall-Nut that explodes on zombies when eaten. Obtained on Night 1.
Corrock: Protects all plants and itself from being lifted away. Obtained on Night 4.
Nebomb: Explodes in a radius on all zombies, but only works if a zombie bites it first. Obtained on Night 6.
Levi-pad: Lifts any Zombie away that steps on it. Obtained on Night 9.
Bolt-Weed: Zaps zombies from underneath and knocks them back. Obtained on Night 11.
Scaredy Shroom: Shoots at zombies from a big range, but hides when they get close. Obtained on Night 15.
E.M.Puncher: Punches zombies front and behind with electricity. Obtained on Night 19.
Astronaut Zombie: Basic rock-walking zombie. 10 health. First Seen: Night 1
Conehead Astronaut: His anti-gravity cone protects him from attacks. 26 health. First Seen: Night 1
Buckethead Astronaut: His darkened space bucket protects him from attacks. 65 health. First Seen: Night 3
ZFO Driver: Abducts plants and takes them away. 30 health. First Seen: Night 5
Astroimp: Comes out of the ground, and continues to the house. 10 health. First Seen: Night 5
Spaceman Gargantuar: Bounces from lane to lane and crushes plants with an asteroid. Throws Astroimp when damaged. 180 health. First Seen: Night 8
Spaceship Zombie: Drives a spaceship which is used to crush plants and speed him up. 30 health. First Seen: Night 10
Spaceplane Zombie: Drives a slow, and deadly tank which shoots plants every 10 seconds. 100 health. First Seen: Night 17
Impunisher: Summoned by Zomboss' creaton, moves slower with more health and damage than a regular Astroimp. Health: 20. First Seen: Night 20.
Zombot Flying Object EX: The boss of Outer Space. Uses a laser to wipe out all plants of one type. Health: 1000. First Seen: Night 20.