The Commander Shroob is a pink Shroob with a black mustache and a whistle. He is encountered during the events of Mario & Luigi: Partners in Time. He is the commander of the Shroob occupation forces during their invasion of the Mushroom Kingdom.
The battle between the four Mario Bros. and the Commander Shroob takes place on Star Hill. During the confrontation, the Commander Shroob commands his Support Shroobs from behind the scenes, allowing his soldiers to fight the heroes while avoiding personal injury. However, the Mario Bros. are able to send the Shroob-omb rolling backwards. The bomb then explodes, knocking the Commander Shroob into the battlefield.
When forced to battle, the Commander Shroob's primary attack is calling his Support Shroobs into the battlefield and launching them at the Mario Bros. Some are sent twirling on the ground, while others are sent flying in the air. While in the air, if a Support Shroob is pointing up, the Shroob falls on top of Mario. If it is pointing downwards, the Support Shroob falls on Luigi. The Support Shroobs can be blocked with swings from the Mario Bros.' hammers. Occasionally, the Commander Shroob approaches the Mario Bros. and shoots them with a ray gun, just like a normal Shroob soldier. It is much faster than a regular ray gun, however. Like most other Shroobs, the Commander Shroob is weak to the Ice Flower.
Eventually, the Commander Shroob directs three more Support Shroobs and a Shroob-omb into the battlefield to continue the fight while he goes back into hiding. As such, the Mario Bros. have to knock more Shroob-ombs backwards to send the Commander Shroob back into the fray until he is defeated.
Six Commander Shroobs can be seen frozen inside blocks of ice while Mario and Luigi battle the Shroobs in Mario & Luigi: Bowser's Inside Story.
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