1-10 TRITON
1-10 Triton is the 10th stage of Cosmos Ch.1 — Beyond the Exosphere. Previous stage: 1-9 Neptune. Next stage: 1-11 Pluto.
Hyppoh, Shibalien Elite and Elizabeth the LVIth 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. 
BAKERY CAT A Curses Alien enemies. 
LITTLE LEAGUER CAT S Resistant vs Alien and Long Distance — a budget anti-Alien backliner. 
BORA S Massive Damage + 100% Weaken vs Alien make it a premier anti-Alien uber. Shibalien Elite as boss with light peon support. Anti-Alien with Warp-Immune cats (Bora line, Catellite) makes this trivial.
Unrestricted gap stage — one of four 'free' stages per chapter (Earth, Triton, Deneb, Mertoz). r/battlecats treats Triton as a 'breathe and farm' beat between Mercury's MAX 20 and the next restriction cluster. Light enemy mix: Hyppoh + Metal Hippoe + Shibalien Elite + Elizabeth the LVIth. No headline boss; the Metal Hippoe is the only thing that breaks momentum if you bring no Crit cats. Lineup: anything that worked at 1-1 Earth still works here. Add Island Cat or Crazed Whale for the Metal Hippoe. Common failure: under-equipping for the Wave Attack on Elizabeth the LVIth (100% Wave) — Anti-Wave frontline or kill her fast before her backswing lands.
The castle you destroy to clear the stage.