"Just What I Needed" was sung by the Cars' bassist Benjamin Orr. The single peaked at number 27 in the US and number 17 in the UK. It also reached #38 in New Zealand. This song first appeared in 1977 on Boston radio stations WCOZ and WBCN from the Cars' demo tape. Shortly thereafter it became one of the stations' most requested songs. "Just What I Needed", along with the entire The Cars album, was released as downloadable content for the Rock Band video game series May 27, 2008. The song was featured during the end credits of Item 47, a short film that is part of the Marvel One-Shots DTV series that was packaged with the release of The Avengers on Blu-ray.
Allmusic reviewer Donald A. Guarisco praised it as "a clever pop song", commenting that "Elliot Easton's fiery guitar leads duel with Greg Hawkes' icy synth lines over a throbbing pop/rock backbeat while Benjamin Orr lays down a fey, detached vocal that captures the sarcastic edge of the lyrics with skill." The song has a minimalistic power pop sound, although has been described as having a hard rock punch by Legends of Rock Guitar: The Essential Reference of Rock's Greatest Guitarists when talking about the band's lead guitarist Elliot Easton, and his notoriety as a rock guitarist.