When does 21 Jump Street return?

21 Jump Street is an American police procedural television drama series that aired on the Fox network and in first-run syndication from April 12, 1987 to April 27, 1991. The series focuses on a squad of youthful-looking undercover police officers investigating crimes in schools, gangs, and other teenage venues. The show was an early hit for the fledgling Fox network, and was created to attract a younger audience. A spin-off series, Booker, was produced for the character of Dennis Booker (Richard Grieco), it ran for only one season, from September 24, 1989, to May 6, 1990.
The series focuses on a group of rookie police officers headquartered at the eponymous address. The show's plots cover issues such as alcoholism, hate crimes, gang violence, drug abuse, homophobia, AIDS, child abuse, and sexual promiscuity.