Immature (later known as IMx) is an American R&B boy band, originally formed in Los Angeles in 1991 by Marques "Batman" Houston, Jerome "Romeo" Jones, and Don "Half Pint" Santos. The group released four albums under the Immature name, including On Our Worst Behavior (1992) and Playtyme Is Over (1994), before changing their name to IMx in 1999 to reflect their maturing sound. With the new name, they released Introducing IMx (1999) and IMx (2001), continuing their success in the R&B scene. The gro