IMx, formerly known as Immature, was an American R&B group, managed by record producer Chris Stokes. Its members included Marques "Batman" Houston (born August 4, 1981), Jerome "Romeo" Jones (born October 25, 1981), and Kelton "LDB" Kessee (born January 2, 1981), all natives of Los Angeles, California, where the group was formed. The group released four albums under the name Immature: On Our Worst Behavior (1992) (which included former member Don "Half Pint" Santos, later replaced by Kessee), Playtyme Is Over (1994), We Got It (1995) and The Journey (1997). In 1999, the group underwent a name change and continued on to release two albums under the name IMx: Introducing IMx (1999) and IMx (2001) and released the Greatist Hits album in 2001. The group also branched out into film (such as House Party 4: Down to the Last Minute) and television (such as A Different World) before disbanding in 2002.