After Booker's old colleague, Judy Hoffs, from his days as a member of 21 Jump Street, he sets out to find the shooter. But also still misses the rush that he got from the job.

Booker sets out to bring down Raymond Crane, the unethical businessman who cost Booker his job on the police force.

The crossover continues on 21 Jump Street S04E10 Wheels and Deals (II).