The Crystal Beast is a Maxis-made captain, present in Galactic Adventures. They appear in the Defend the Crystal Mine adventure, where they are known as Ice Stalkers.

In the adventure, they have 25 awareness, 2 Speed, 50% Damage Bonus, and 33 Health. They are the second form of invader in the adventure. Their behavior is Advanced; they are forced to attack and destroy the Mine Generator (Main) building, except to defend themselves against attack by the player's allies.