Filibuster Obstructa (スターフィリバスター Sutāfiribasutā, Star filibuster) is an enemy that appears in Cats of the Cosmos Chapter 3. He appears in his own special stage that works like Zombie Outbreaks, albeit in Cats of the Cosmos Chapter 3, and it is only available once the chapter is completed.
Filibuster Obstructa will destroy the Cat Base in one hit, no matter what, so the goal, when facing this enemy, is to never let him complete his attack animation.
His attack animation is 40 seconds long and he has 200 knockbacks, making it fairly easy to interrupt his attack, as only 10,000 damage is needed to trigger a knockback. The problem lies in his immunity to the Cat Cannon and shockwaves, not to mention his massive range, which makes this enemy hard to reach.
*In each stage, there is strength magnification, the value of health and attack power varies due to this value.
This enemy has the highest base attack power of any enemy in the game, standing at 1 million, barely surpassing the Scarecrow's and Teacher Cybear's 999,999 damage.
Prior to version 8.3.2, Filibuster Obstructa had an effective range of 50~4050, rather than 300~4300. This would cause it to stand 50 range away from the base, and thus in front of the enemies designed to protect him. This change was made to prevent the player from killing filibuster with one Sniper Cat ability, and nothing else.
Filibuster Obstructa is tied with Angry Sun for having the longest standing range out of all enemies.
Filibuster Obstructa has no shadow, however, every time he is knocked back you can see his shadow, but it disappears when the knockback animation finishes.
Filibuster Obstructa has one of the highest knockback counts in the game.
Some cats could, technically, survive Filibuster's attack, though the base will still be destroyed regardless.
Filibuster Obstructa is the only Starred Alien with neither the warp nor barrier ability.