2-2 MARS
2-2 Mars is the 2nd stage of Cosmos Ch.2 — The Passion of Catgod. Previous stage: 2-1 Earth. Next stage: 2-3 Jupiter.
Hyppoh, Shibalien Elite, Star Peng and Helmut Krabbe 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. 
WHEEL CAT A Deals Massive Damage to Alien enemies — a huge area nuke against Alien crowds and bosses. Also fits “Clear the crowd.” 
SURFER CAT A Area Freeze vs Alien controls Alien groups. Also fits “Clear the crowd.” 
CATMAN S Deals Massive Damage to Alien in every form. Also fits “Clear the crowd.” 6 enemy types stack up here. Area attackers hit the whole push at once instead of one unit at a time.
VALKYRIE CAT A Hits the whole group while it freezes them. WHEEL CAT A Hits every Alien in a wide area at once, melting grouped Star Aliens. Also fits “Counter Alien.” SURFER CAT A Area damage hits grouped enemies. Also fits “Counter Alien.” CATMAN S Long-range Area damage clears groups. Also fits “Counter Alien.” 
ACTRESS CAT B Hits multiple enemies at once for budget crowd damage. Star Peng spam (100% Warp back 500 range for 3.3s) on top of the regular Alien peon wall. Specials are banned, so the Bahamut and Loincloth Cat backbone of Ch.1 evaporates — the carry shifts to Anti-Alien Ubers with built-in Warp Immunity (Bazifenix, Luminalia) and Macho Leg Cat as the only Normal-tier Anti-Alien backup.
Same No Specials restriction, now with Star Peng spam added to the Hyppoh + Helmut Krabbe + Shibalien Elite mix. r/battlecats: 'easier than 2-1 Earth because there's no Barrier wall, but the warp from Star Peng will catch you out if your backline isn't built for it.' Lineup: Normal-tier meatshields (Cat, Tank, Wall) → Warp-Immune backliners from Rare/SR/UR pool (Bora-line Pixies, Rover Cat Mk II, Mighty Reza) → 1-2 Anti-Alien Ubers for boss damage. Common failure: forgetting Star Peng warps your damage cats back 500 range for 3.3s. If you have no warp immunity, the Anti-Alien Ubers you brought to win the stage spend it sitting next to your base.
The castle you destroy to clear the stage.