Super Mario Galaxy Edit
Mario first fights Bowser in Bowser's Star Reactor. He fights him unlike other battles: they fight on a round planet covered with glass panels with lava under it. Bowser can pounce on you. To defeat him, you need him to pounce on the panels to burn him. After, he will run around, which you will then need to Star Spin him. Do this three times to defeat him.
You fight him again on Bowser's Dark Matter Plant in the same fashion, but Bowser now generates shock waves when he lands on the ground.
Rest to be announced