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Showdown (known as Clash of Captains in Mario & Luigi: Superstar Saga + Bowser's Minions) is a captain command in the Minion Quest: The Search for Bowser and Bowser Jr.'s Journey modes of Mario & Luigi: Superstar Saga + Bowser's Minions and Mario & Luigi: Bowser's Inside Story + Bowser Jr.'s Journey respectively.
In Minion Quest: The Search for Bowser, Clash of Captains is Captain Goomba's ninth Captain Command. It costs six CP to use. When used, the captain will challenge the opposing captain to a one-on-one battle, but not before proceeding to take damage from the allies that try to stop him. The move (and the battle) ends when one of the captains is defeated. Private Goomp is the only enemy captain that can use it.
In Bowser Jr.'s Journey, this command goes under its current name. Bowser Jr. can use it if he is set as a Melee type, it costs five CP to use, and the first officer will defend him on his way to the other captain. There are lots of enemy captains, such as Beef, who use this command as well.