The 5th Dimension is an Americanpopular music group, best-known during the late 1960s and 1970s for popularizing hits of songwriters like Jimmy Webb, Laura Nyro, Ashford & Simpson, and others, and helping to popularize "flower power" music with both white and black middle-class Americans. Some of their most famous hits include:
"Up, Up, and Away"
"One Less Bell to Answer"
"Wedding Bell Blues"
"Aquarius/Let the Sun Shine In"
"California Soul"
"Stone Soul Picnic"
"Workin' on a Groovy Thing"
Some of the songwriters popularised by The 5th Dimension later went on to careers of their own, especially Ashford & Simpson, and two members of the group gained later fame under the own names as Marilyn McCoo and Billy Davis Jr.
He soon told Superman that he was a jester in his home dimension, explaining why he used his powers to play practical jokes.
After the establishment of DC Comics' multiverse in the 1960s, it was later explained that the purple-suited Mxyztplk lived in the fifth dimension connected to Earth-Two and the orange-costumed Mxyzptlk in the fifth dimension connected to Earth-One.
In early post-Crisis stories the "condition" that would send him back to the fifth dimension was anything he wanted it to be but, since Lex Luthor taught him how to lie, making this meaningless, the stories have reverted to Mxyzptlk saying his name backwards.