Alien Mothership

The Alien Mothership is an enemy in Swamp Attack.

It is the boss of Episode 4.

Abilities
The Alien Mothership is invincible, but can be defeated if all turrets have been destroyed.

As long as the ship is still there it will continue to spawn Alien UFOs which again, attacks by shooting low-damage lasers at the house. It's turrets will also fire at the player constantly. Unlike the abilities of certain late-game enemies, it cannot stun the player.

The Mothership is immune to the Fridge and any type of stun from electrical discharges, as well as burning effects from Incendiary/Acidic Weapons. However, it will still take normal damage from weapons like the Blob Thrower.

Trivia

 * In the ending cutscene of Episode 4, the burning mothership escapes, dragging smoke behind. It eventually explodes mid-air in a mushroom cloud, and is never seen afterwards.
 * However, judging from the big hole it made inside a military nuclear facility, it was likely responsible for the subsequent security breach and radiological contamination.
 * It is the largest enemy in the entire game, as even the entire screen does not appear to be able to accommodate it.