A key issue noted for First appearance of Circuit Breaker. The Transformers #9 was published by Marvel Comics on October 1, 1985, as part of a series that began in 1984. Ann Nocenti and Bob Budiansky write, and art comes from Al Milgrom, Dennis Janke and Joe Rubinstein. This 36-page issue features Optimus Prime, Starscream, Bumblebee, Ratchet and Prowl, among 23 characters cataloged on VerseDB.