3-IN FILIBUSTER INVASION
3-IN Filibuster Invasion is the 49th stage of Cosmos Ch.3 — Even Stars Burn Out. Previous stage: 3-48 The Big Bang.
Ch.3 bonus stage that overrides a random Ch.3 stage upon clearing the chapter. Filibuster Obstructa (2M HP, 1M damage, Long Distance 300~4300) WILL one-shot the Cat Base from any position — your only hope is interrupting his 40-second foreswing with rapid 10k+ hits across his 200 knockbacks. Cat Cannon and Wave Attacks are blocked, so timing is everything. Win unlocks Filibuster Cat X.
A Cats of the Cosmos bonus boss with 2,000,000 HP and a 1,000,000-damage Long Distance attack (effective ~300–4,300 range), and it's Immune to Waves. Its very long (~40s) attack foreswing is the weakness — interrupt it with rapid 10k+ hits across its many knockbacks before it fires.
Teacher Bun Bun's Alien/Floating variant — 750,000 HP, 8,888 AP area attack at 200 range, 100% Wave Attack. Boss of Deneb Ch.2 and appears in the Filibuster bonus stage. Wave-Immune meatshields + Anti-Alien/Anti-Floating Ubers (Holy Valkyrie, Wonder Mommy).
A Red-trait area attacker with high HP and heavy short-range (130) hits. Out-range it and chip it down with anti-Red units.
A much tougher Dark-trait Kang Roo with rapid multi-hit area attacks — high DPS that can plow through your frontline if you can't out-damage and knock her back. Not a peon.
15k 
6k Beefy Gory variant with Area Attack and a 6,000-damage Barrier. Once the Barrier breaks he's vulnerable to crowd control (Seafarer Cat, Surge units).
Kid Tappa and General GreGory carry Barriers (up to 15,000 HP) — your hits are absorbed until it's broken.
SUPERCAR CAT B Guaranteed 100% Barrier Breaker. Also fits “Burst the boss down.” 
SPACE CAT A 50% Barrier Breaker. 
FENCER CAT A Guaranteed 100% Barrier Breaker at long range — the reliable accessible breaker. 
KOMORI S 100% chance to break Barriers. Also fits “Counter Alien.” 
LUMINA S 100% Barrier Breaker opens Star Alien Barriers for the team. Also fits “Counter Alien.” 
LI'L GROSS CAT B 30% Barrier Breaker. Also fits “Counter Alien.” Filibuster Obstructa, Bun Bun Symbiote and General GreGory are Alien. Anti-Alien units take less damage and deal more.
GROSS CAT A Its True Form is Strong Against Alien, giving budget anti-Alien value. LI'L GROSS CAT B True Form has a 30% Knockback vs Alien. Also fits “Break the Barrier.” 
JETPACK CAT A Resistant to Alien — durable against Alien attackers. Also fits “Counter Dark.” 
LITTLE LEAGUER CAT S Resistant vs Alien and Long Distance — a budget anti-Alien backliner. Also fits “Break the Barrier.” 
TEKACHI A Resists and dodges Alien attacks. Also fits “Break the Barrier.” Bore is Red. Anti-Red units take less damage and deal more.
FISH CAT A Strong Against Red and tanky for the cost — a sturdy anti-Red frontliner. 
DOM CAT B Strong against Red — 1.5x damage, takes 1/2. Also fits “Counter Dark.” 
CARPENTER CAT A Resistant to Red — durable against Red attackers. Also fits “Counter Floating.” 
CATWAY A Strong against Red. Also fits “Counter Dark.” 
THE WHITE RABBIT S Slow, Strong and Weaken vs Red. Also fits “Counter Alien.” Filibuster Obstructa and Bun Bun Symbiote are Floating. Anti-Floating units take less damage and deal more.
SABER THE CAT C Saber Alter Cat: Strong against Floating enemies (Deals 1.5x damage, only takes 1/2 damage) CARPENTER CAT A Resistant to Floating — durable against Floating attackers. Also fits “Counter Red.” 
BODHISATTVA CAT A Slows and (True) Weakens Floating enemies. TEKACHI A Resists and dodges Floating attacks. Also fits “Break the Barrier.” 
HIGH LORD BABEL S Equally tough against Floating enemies, with Colossus Slayer. Also fits “Counter Red.” Shadow Boxer K is Dark. Anti-Dark units take less damage and deal more.
DOM CAT B True Form (Dark Lazer) is also Strong against Dark. Also fits “Counter Red.” JETPACK CAT A Resistant to Dark — durable against Dark attackers. Also fits “Counter Alien.” CATWAY A Strong against Dark. Also fits “Counter Red.” KOMORI S Curse, Resistant and Barrier break vs Dark. Also fits “Break the Barrier.” 
CATS IN A BOX B True Form has a 30% chance to Weaken Dark enemies. Filibuster Obstructa has a deep HP pool (2,000,000+ even before stage magnification). Heavy single-target burst shortens the fight.
SUPERCAR CAT B 51,000 damage per hit at Lv.30. Also fits “Break the Barrier.” 
KASA JIZO S Its castle forms hit for enormous area damage to crack Dark/Angel bosses. Also fits “Counter Dark.” 
GAIA THE CREATOR S Long-Distance multi-hit with Insane Damage — a generalist wall-cracker. 
BAHAMUT CAT S Huge multi-hit burst — a story-unlock powerhouse that deletes tanky enemies. 
CHILD OF DESTINY PHONO S Big Multi-Hit Massive-Damage bursts from safety. The most-quoted 'bait' stage in the entire game. Filibuster Obstructa one-shots your Cat Base from any range (Long Distance 300~4300). No-continues restriction means you get one shot per attempt. Community consensus: this isn't a stage you clear — it's a stage you outpace. Rapid 10k+ hits during his 40-second foreswing window are the only path; Cat Cannon and Wave Attacks are both blocked. Required lineup always includes Manic Lion / Manic Eraser for fast meatshield spam, multiple Bahamut variants (Crazed + Awakened + base Bahamut Cat) for stacked burst chip, and the entire Uber roster for backline DPS — Ganglion, Bombercat, Twinstars, whatever you have. Common failure: assuming his one-shot is preventable. It isn't. You're racing his foreswing. Win unlocks Filibuster Cat X, which many players consider the best 'reward' Special Cat in the game.
The castle you destroy to clear the stage.