SteamBestHistoric Low$1.99
Strategy
Illegal Alien Tower Defense — Best Price & Deals
Released: May 26, 2026
PC
Wait before buying Illegal Alien Tower Defense — ThereAny Score 54/100, currently at or within 3% of its all-time low.
Our take
Next major sale: Autumn Sale in 32 days
Shapeshifting Alien Trespassers have invaded Earth!
Their vile species, known as "Third-Worlders", hails from the third planet of a nearby star system, and have now unleashed their rampaging hordes, consuming everything in their path, seeking to turn all of Earth into a dumpy Third-World Hellscape!
You play as Johnny Righteous, a mild-mannered computer programmer working at the Department of Defense on a top-secret Defensive AI, known as Sentinel, before it was mysteriously cancelled. Now, using the last copy of Sentinel's code, it is up to you to turn back the tides of the invasion.
Can you save civilization from the brink of collapse, and restore our High-Trust society?
Or will evil Alien Shapeshifters win World War 3 by waging a Third-World War?
Illegal Alien Tower Defense has 1 active deal across Steam. The current lowest price is $1.99 on Steam — a 0% discount off the $1.99 retail price. Historical low: $1.99 (Aug 28, 2026). Compare prices on Steam, Epic Games Store, GOG, Fanatical, and more major PC game retailers below.