The Wack Pack is the name given to a wide assortment of personalities heard throughout the history of The Howard Stern Show. As a parody of the Rat Pack or Brat Pack, they are a considerable part of what the radio show became notable for. Members of the pack, known as "Wack Packers", tend to be unusual in some way such as being blatantly racist, mentally disabled, perverted or having a comical voice, appearance or ability.
Not every regular guest on the show is considered a member, nor are any of the show's staff members. Through their appearances on the radio show, some Wack Packers have gained notoriety for personal appearances around the country and occasionally, played small roles in films and television programs. In the 1993 book Private Parts, Howard Stern lists early members of The Wack Pack, including Irene the Leather Weather Lady, who is essentially the first Wack Packer, having met Stern in May 1980 when he was broadcasting from WWWW in Detroit, Michigan.
The introduction of Fred the Elephant Boy on the radio show on November 28, 1988 however, among a collection of others, made Stern call these group of show personalities as "The Wack Pack" on July 6, 1990 as documented in The History of Howard Stern.