Red Hot 'Rangs is an upgrade to the Boomerang Thrower that made its debut in Bloons TD 3, but it went under a different name, Thermite. This upgrade was removed in Bloons TD 4, but reintroduced in Bloons TD 5. It changes the boomerang's colour to red and allows the boomerangs that the Boomerang Thrower throws able to pop Lead Bloons.