Invader (いんべーだー Inbēdā?), also known as Super Socket, is a recurring enemy in the Bubble Bobble series. Invaders are based off of the titular enemies from Taito's arcade title Space Invaders, and appear in most main-series Bubble Bobble games.
Invaders are mechanical creatures with two blue antennae, and are generally shown with bodies vaguely shaped like a pentagon. Their arms and legs move in a motion reminiscent of the enemy sprites from Space Invaders, and have mechanical joints. Their bodies are colored silver, and in most appearances, the bottom half of their bodies are purple in color. In Bubble Bobble Plus!, Invaders take on a more blocky appearance reminiscent of a 3D model of their original sprite from Bubble Bobble.
Invaders' main form of attack is firing a laser downwards. The laser can travel through platforms, and will cause Bub and Bob to lose a life if they make contact with it. Unlike most enemies, Invaders are only able to move left and right, and cannot jump in any way, though they move faster than most other enemies.
Invaders first appear in Bubble Bobble, and are first encountered on Round 60. They move back and forth rapidly, firing lasers down at the player to attack. Invaders are the only enemy not encountered in the game's Super Mode, and are replaced by Hidegons in said mode.
Invaders appear as an enemy in Rainbow Islands, and are only encountered on the game's final world, Bubble Island. They behave similarly to their appearance in Bubble Bobble, but are in a perpetually angered state, like the other enemies encountered in the world.
Invader returns as an enemy in Parasol Stars, appearing in the game's penultimate world, Bubble Star, a world based off of the original Bubble Bobble. The Invaders in this game have a slightly different appearance than most of their other incarnations, having a much wider body, differently shaped antennae, and having red orbs at the end of their arms, resembling the enemy sprites from the original Space Invaders. Despite this, they behave nearly identically to their original appearance in Bubble Bobble.
Invaders appear as enemies in Bubble Bobble Part 2, having the same behavior as their previous appearances. In this game, they are completely yellow and lack antennae.
Invaders appear as an enemy in Bubble Bobble Junior, returning to their original design. A new enemy known as Invader Crate is introduced that resembles a large UFO. Invader Crates constantly spit out Invaders to attack the player, only stopping upon being defeated by being hit with bubbles multiple times, or being hit with a Special Bubble.
Invaders appear as enemies once again in Bubble Symphony, behaving much like their previous incarnations. A Giant Invader appears as the boss of the TV Machine and Central Park worlds in a boss battle that serves as an homage to Space Invaders, summoning rows of Invaders in a manner reminiscent of the original arcade title's gameplay. Two new varieties of Invaders based off of the different enemy types in Space Invaders appear during this boss fight, one resembling the Invader design used in Parasol Stars, having flat antennae and a more box-shaped body, and another with closed eyes that lacks arms and antennae.
An Invader appears in the SNES version of Bust-A-Move as the eighth opponent encountered in Vs. Mode. They make an appearance outside of Vs. Mode in all versions of the game, being trapped inside the red bubbles featured in normal gameplay.
Invaders make yet another appearance as enemies in Bubble Memories, behaving similarly to their past appearances. In this game, they have orange antennae as opposed to the usual blue color seen in most games.
Invaders appear once again in Classic Bubble Bobble, with very little changes to their behavior compared to previous installments of the series. A giant Invader named Lemon appears as the boss of the Night Area.
An Invader makes a minor appearance in Bust-A-Move Millennium, acting as the cursor on the main menu.
Invaders appear as enemies in Bubble Bobble: Old & New, mirroring their appearance from the original Bubble Bobble. In the game's "New" mode, they receive a redesign, having a much more square body shape, and are now completely white in color like the sprites from the original Space Invaders.
Invaders reappear in Bubble Bobble Revolution, once again retaining their behavior from the series' previous installments. The boss of Steam Works, the game's fifth world, is a giant UFO piloted by three Invaders.
Invaders appear as enemies in Rainbow Islands Revolution, mirroring their appearance in the original Rainbow Islands. They are once again encountered on Bubble Island, but are not in an angered state this time.
Super Sockets reappear in Bubble Bobble Plus!, retaining their behavior from the original Bubble Bobble. In this game, they now sport a more block design reminiscent of their original sprites.
An Invader is the final opponent faced in the Vs. Mode of Bust-A-Move Plus!.
An Invader appears as the boss of the Astro-Machine level in Bust-A-Move Universe, guarding a dark blue Bubble Dragon.