Terror Squad was an American hip-hop collective established in 1998. Based in the Bronx in New York City, the members of Terror Squad were first heard on member Fat Joe's albums Jealous One's Envy and Don Cartagena. Terror Squad released its debut album, Terror Squad: The Album, in 1999, with its first major hit "Whatcha Gon' Do", credited mostly to Big Pun, who died of a heart attack in 2000. After Big Pun's death, his longtime partners Cuban Link and Triple Seis left the group and were subsequently replaced by Remy Martin and Tony Sunshine. In 2004, their song "Lean Back" peaked at No. 1 on the Billboard Hot 100.