Behemoth King is a more difficult version of Behemoth encountered in the Star Cup of Sports Mix mode of Mario Sports Mix, thus making Behemoth King the game's second and final boss. It is fought when the players' team beats the Final Fantasy team (consisting of either just Ninja and White Mage when playing with 2 characters, or both with Black Mage when playing with 3 characters) and obtains the luminescent multicolor crystal. The events that follow this are not vastly different with the precursor to Behemoth; once the crystal gets placed, it turns dark and drags the ship into a portal, which the players' characters encounter. However, the crystal materializes into Behemoth King instead of Behemoth.
Behemoth King is more aggressive and it has more health than Behemoth. The fight itself is, however, very similar to the original Behemoth. Players can directly attack by charging hockey sticks-like weapons, but it deals small damage. Throughout the battle, as in Behemoth, ? Panels spawn and grant teammates meteors that can be passed to other teammates similar to a volleyball, which each passing increasing its power similar to collecting coins as well as filling a special attack meter. Other items including Green Shells and Bob-Ombs appear from ? Panels and can deal small damage as well as preventing it from attacking. Coins additionally power up the move. Behemoth King can attack by shooting three fireballs. It can also cause meteors to rain on the team after charging with black swirls around it. It also can use its horn to strike teammates with thunderbolts, which can be dodged if timed correctly. If players get too close, Behemoth can strike them with its tail or claws. It can also do a spin attack that deals small damage. It can also perform a high jump and do a body slam, as with the original Behemoth.
Winning against the Behemoth King changes the Sport Select screen's hue from white to red.
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