In the past Buttercup was knocked in the ocean after having a battle with Mojo jojo, before Planet Fuse Arrived.....
The IAU arrived at a new definition for "planet" which left Pluto out in the cold. It is now designated as a "Dwarf Planet".
Planet of Death happened in 1997.
Planet Stronghold happened in 2011.
Planet Laika happened in 1999.
Tasty Planet happened in 2006.
Planet Harriers happened in 2000.
Planet's Edge happened in 1992.
Planet Minigolf happened in 2010.
Planet Pachinko happened in 2009.
Bad Planet happened in 2005-12.
The IAU arrived at a new definition for "planet" which left Pluto out in the cold. It is now designated as a "Dwarf Planet". also it was called a planet when is was larger but now it has become smaller scientists no longer class it as a planet
Planet of Fire happened on 1984-03-02.