Ben Barber graduates from the police academy and is now a full fledged Atlanta P.D. cop, and wants to make it as a detective. James, Ben's soon to be brother-in-law, is still annoyed by his tactics. Ben is about to get married to James' sister Angela, but their boss Lt. Brooks (Bruce McGill) assigns them on a huge case that is in Miami, where they will be working with the Miami Police Department.
Jimmy Callahan provides best man services, through The Best Man Inc., for guys who don't have the friends necessary for a wedding. Doug Harris, a successful tax attorney, and his fiancee Gretchen Palmer are planning for their wedding day. Doug becomes frantic searching for a best man, and is referred to Jimmy's company by his party planner, Edmundo.
In 1986, Eric "Eazy-E" Wright enters a crack-house to sell drugs, but, it is soon raided by the police, who gain entry into the house via a battering ram. Eazy escapes through the house's rear window. Later, Eazy goes to a club with Lorenzo "MC Ren" Patterson to see friends Andre "Dr. Dre" Young, O'Shea "Ice Cube" Jackson and Antoine "DJ Yella" Carraby, who perform the song "Gangsta Gangsta", while Eazy and Ren stand in the audience. After Dre leaves the club, he is arrested after breaking up a fight involving his brother, Tyree. Eazy bails him out the next day. The next morning, Dre talks to Eazy about investing money into a start-up record label, in order to record a track that Cube has written. Cube and Dre want rappers H.B.O.(Homeboys Only) to record the track. Eazy agrees to fund the project. After a conflict arises during the recording session, H.B.O. leaves and Dre convinces Eazy to perform the track. They record and release "Boyz-n-the-Hood". Jerry Heller approaches Eazy and asks if he can be their manager. The group accepts Heller's offer. While performing "Dopeman", they garner the attention of Bryan Turner, a producer at Priority Records, with which they sign. Afterwards, N.W.A commences recording their debut album, "Straight Outta Compton", with Heller. During one of the sessions, they are harassed by some police officers. Frustrated by the situation, Cube writes "Fuck tha Police".
Colin Evans (Idris Elba) is denied parole by the Tennessee Department of Correction, five years into serving a prison term for manslaughter, having killed a man and suspected of killing five women. However, he escapes while being returned to prison, shooting a guard and driver in the process.
Cedric (Kevin Hart) begins by saying how Las Vegas has always been a place for casinos and showgirls, and is the perfect place for couples to get married.