When Cave Carson and his team go missing during an inner-Earth expedition sponsored by Simon Stagg, the male Outsiders investigate and discover a war at the earth’s core! Meanwhile, the female Outsiders are summoned to Abyssia to help them against two invading underground forces! The team encounters danger beneath the surface of the earth as their old foes the Masters of Disaster and Baron Bedlam return to attack them! Introducing the newest members of the Outsiders, Windfall and Princess Vee-Raa!