: Ensure you have all Anti-Starred Alien Treasures from Cats of the Cosmos; without them, his health is effectively 32,000,000, making him nearly impossible to knock back in time.

The music's 40-second main loop is synchronized with the boss's attack animation. If the loop finishes before you interrupt him, it's usually game over. : Starred Alien, Floating. Health : 2,000,000 (at 100% treasure magnification).

: You can stream a high-quality version by Riku_murft or the Filibuster Obstructa track by NC7.

: The theme is exclusive to the Filibuster Invasion stage (Cats of the Cosmos Chapter 3) and a few select endgame stages like Hell's All-Stars and A Whole New World . The Boss: Filibuster Obstructa