In this game, Sergeant Guy, along with Private Goomp and Corporal Paraplonk, first see Bowser when he was searching through Dimble Wood looking for his Banzai Bill to help take down his castle that has been taken over by Fawful. Sergeant Guy says it may have feel somewhere deeper in the woods and Bowser goes to investigate. Bowser eventually comes back with the Banzai Bill and Sergeant Guy allows Bowser to fire it with his large cannon. The Banzai Bill hits Fawful's (Bowser's) Castle but it then starts to move up and down with messy fashion and then crushes Bowser. However, with help of Mario and Luigi, Bowser then suddenly grew into a giant, while surprising Sergeant Guy and the others. After Bowser defeats his castle, he enters it leaving Sergeant Guy and the others. Sergeant Guy isn't seen again until Bowser's second run through his castle. It is revealed that one of the Star Cures is located in Bowser's treasure room deep below his castle in a safe. Bowser then defeats the train and then remembers the combination and opens the safe. However, Sergeant Guy, along with Private Goomp and Corporal Paraplonk, turn on Bowser and pushes him into the safe. Sergeant Guy is excited that they will receive payment from Fawful. During the end of the game after Fawful (and the Dark Star) have been defeated, Sergeant Guy, along with the others, appear at Bowser's bed side asking for forgiveness. Bowser forgives them, then yells at them all to help rebuild the castle and Sergeant Guy and the others run off excited.
| Dream Team boss|
|Location||Dreamy Driftwood Shore|
|Item dropped||Action Hammer (100%)|
In this game, Sergeant Guy along with the others have been promoted and they assist Bowser in his world takeover with Antasma. Sergeant Guy is involved in a plan where Mario and Dreamy Luigi were fooled by a Kamek dressed as Princess Peach. Sergeant Guy, Private Goomp, and Corporal Paraplonk then all fight Mario, fused with Dreamy Luigi. However, they were beaten in the process. Angry Kamek then demotes Sergeant Guy and the others where they must now scrub Neo Bowser Castle.