Boss Galaga (ボス・ギャラガ, Boss Galaga) are the strongest of the main enemies in the Galaga series by Namco.
In Galaga, Boss Galagas appear as one of the common enemies of normal stages. They attack by flying down and firing their tractor beam at the player: if they hit they capture the player's ship, flying back up to the swarm with it and causing the player to lose a life. During the procedure, the same sounds heard in SSB4 are played. If the Boss Galaga with the ship is defeated while flying at the player, the captured ship will join up with the player's current ship, doubling their firepower. Like in SSB4 the Boss Galaga takes two hits to defeat: it turns purple when hit once and it explodes when hit twice.
The Boss Galaga appears as an item, and is one of the two items introduced in Smash 4 (the other being the Beetle) that can potentially OHKO opponents by sending them up to the upper blast line. When thrown, Boss Galaga will fly to the top of the screen (dealing a small amount of damage to anyone it collides with), then fly in formation as it did in its home series. After such, it will dive down and home in on the targeted player's last known position and fire its tractor beam. If it misses, it will fly offscreen and do nothing, but a character caught by its tractor beam will be taken to the top of the screen and over the upper blast line while 8-bit sound effects from the original Galaga plays: this can be avoided by mashing buttons to escape. The tractor beam can only catch fighters a few moments after being fired; anyone near the beam after that will not be affected.
A Boss Galaga can take damage while it lies on the ground, while being held, as it hovers in mid-air and while it fires its tractor beam: after the first hit it turns blue and purple, and after the second it is destroyed in a flurry of purple pixels. Similarly to the Beetle, it is incredibly difficult to escape from the Boss Galaga's grasp if the victim is at 50% or higher, though it is possible to shake out at low percents. It's possible for a Boss Galaga to remain in place with a captured fighter if a solid ceiling or something similar blocks its path, which gives the victim time to escape or after a while, will cause the Boss Galaga to release them.
Boss Galagas will disappear if thrown above the upper blast line.
In Smash Tour
The Boss Galaga appears as a blue item: when selected, the opponents' positions on the map will be randomly swapped.
A Boss Galaga Smash is one of the possible battle types: in it, only Boss Galagas appear as items.
The Boss Galaga keeps its function from SSB4. Additionally, when a character gets caught the background of the stage changes into a spacescape reminiscent of the original Galaga game. It always carries the player into a Star KO, except on certain stages. The Boss Galaga will remain alongside the Star KO'd player in the background as they fly off and disappear. Oddly, it cannot be spawned on certain stages.