New Knockout City Heroes Trailer Reveals The Superpowers You Can Unleash In Upcoming Event Knockout City Heroes is scheduled to begin August 24. Knockout City Season 4 — Alien Invaders Launch Trailer Season 4 is coming to Knockout City… and it’s bringing some new friends. Friends from out of town. Far out of town. You might even say they’re out of this world.ALIENS! Roll out the welcome mat or warm…
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