Super Mario Galaxy 2 is a 2010 platform game developed and published by Nintendo for the Wii. It was first announced at E3 2009 and is the sequel to 2007's Super Mario Galaxy. It was released worldwide in 2010. Much like the first game, the story follows Mario as he pursues the Koopa King, Bowser, into outer space, where he has imprisoned Princess Peach and taken control of the universe using Power Stars and Grand Stars. Mario must travel across various galaxies to recover the Power Stars in order to travel to the center of the universe and rescue Princess Peach.

Princess Peach is a character in Nintendo's Mario franchise. She was created by Shigeru Miyamoto and introduced in the 1985 original Super Mario Bros. game as Princess Toadstool. She is the princess regnant and head of state of the Mushroom Kingdom, where she resides in her castle along with Toads. Since her debut, she has appeared in the majority of Mario video games as the main female character and the romantic interest of Mario. She has been voiced by Samantha Kelly since 2007.