Usually, Mario games stop you from using a Star in boss fights, so your one-hit kill power does not mess up the battle. Here is what happens when we actually bring Stars into boss fights.

Games
Super Mario Bros. - NES
Super Mario Bros. 2 - NES
Super Mario Bros. 3 - NES
Super Mario Land - Game Boy
Super Mario World - SNES
New Super Mario Bros. - DS
New Super Mario Bros. Wii - Wii
Super Mario Galaxy 2 - Wii
Super Mario 3D Land - 3DS

1080p 60fps gameplay recorded and edited by Nintendo Unity.
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