Giant Baby Bowser

Giant Baby Bowser is the final boss of Super Mario World 2: Yoshi's Island and Yoshi's Island: Super Mario Advance 3, appearing in King Bowser's Castle.

After Yoshi defeated Baby Bowser, an enraged Kamek used his greatest magic to enlarge him to enormous sizes.

Most of the playroom was then destroyed as Giant Baby Bowser rised in the background. He begun the final battle by sending debris tumbling down and destroying some of the floor that Yoshi was standing on. He then started shooting large fireballs out of his mouth at Yoshi. During the battle, Yoshi eventually noticed a balloon carrying a Giant Yoshi Egg. Yoshi snatched the egg and, with precise aim, launched it at Giant Baby Bowser, sending him farther back.

Yoshi had to continue to throw eggs at Giant Baby Bowser, because him getting too close meant the entire platform collapsing, instantly killing Yoshi. Once Yoshi hit Giant Baby Bowser enough times, he would send more debris falling down, crumbling even more of the floor. Yoshi pelted a few more eggs at Giant Baby Bowser until he couldn't take anymore, and returned to his normal self. Kamek flew off with him, vowing revenge. Yoshi then ran up to The Stork and Baby Luigi, freeing them both, and handing Baby Mario to the stork as well. He then makes his delivery, and the end credits roll.

In Yoshi's Island DS, a similar character - Giant Bowser - appeared as the final boss.