The Wish-Granting Clock (aka Nova)

Galactic Nova (also known as just simply Nova) is a character in the Kirby series, debuting in the Milky Way Wishes sub-game in Kirby Super Star. It is a giant comet made out of random pieces of metal, machinery and debris.

Nova has the ability to grant one wish upon being summoned, but that can only happen when the fountains of the planets surrounding Planet Popstar are harnessed. Kirby summoned it to stop a violent war between the Sun and Moon. Although this particular machine only appears in Kirby Super Star and its remake, the series repeatedly implies that more of these comets exist; this is confirmed in Kirby: Planet Robobot, where the Access Ark is revealed to be a second such comet.

Nova makes his first appearance when Kirby summons it with the power of the Stars found on different planets. Kirby was about to make his wish, but Marx knocked him off-screen and made his own wish for world domination on Popstar. Nova begins a collision course towards Popstar to fulfill Marx's wish, ignoring the fact that Kirby was the one to collect the power required to summon it. Fortunately, the Sun and Moon delay Nova's journey for just enough time so Kirby could fly into the comet and disable its heart.

Galactic Nova Nucleus serves as a boss battle which involves shooting at the pillars surrounding Nova's actual heart, which are guarded by rocket-like auto-turrets. When the pillars are all destroyed, the Nucleus shoots out and part of Nova's left side explodes, paralyzing it and enraging Marx. Marx himself gets launched into the destroyed part of Nova when he is defeated, thus causing a chain reaction that creates a massive explosion. Nova was annihilated, and was shown to have blown to pieces during the sequence.

Both Marx and the Galactic Nova Nucleus return as bosses in The Arena.

(Taken from the Kirby Wiki)