Agent Steel is an American speed metal band from Los Angeles, formed in 1984 by vocalist John Cyriis with drummer Chuck Profus.

They were most notable for Cyriis' high-pitched vocals, catchy songs, melodic riffs, and fast tempos mixed in with interest in UFOs.

Agent Steel reformed in 1998 (without Cyriis, although he would return to the band in 2010, only to leave again in 2011) and released three more full-length albums before going on hiatus in 2011.

The band reformed again in 2018, this time with Cyriis returning as the vocalist and without any previous members (including longtime guitarist Juan Garcia, who is now in Evildead and Body Count); under this new lineup, Agent Steel released their first studio album in 14 years (and also their first in 34 years to feature Cyriis), No Other Godz Before Me, in 2021.

[3] The first legal registration of the name Agent Steel was registered by Cyriis on July 23, 1984, as a DBA at the Los Angeles County Clerk's Office.

The lineup then consisted of drummer Chuck Profus, guitarists Bill Simmons and Mark Marshal, and bassist George Robb.

John Cyriis and Chuck Profus moved to Florida for various reasons, while the rest of the members remained in California.

Why they did so, remains a mystery to this very day..."[6] In 1998, guitarists Juan Garcia and Bernie Versailles reformed Agent Steel without Cyriis' consent, featuring returning members Chuck Profus and Michael Zaputil, and new vocalist Bruce Hall.

[17] On January 24, 2011, Agent Steel announced that Cyriis would not perform with the band on the 70000 Tons of Metal cruise due to "unfortunate events".

Guitarist Juan Garcia denied any rumors that Rick Mythiasin was the band's new vocalist, but was only a temporary fill-in for Cyriis.

[21] Meanwhile, the remaining members of Agent Steel have continued to perform as Masters of Metal, releasing their debut album From Worlds Beyond on September 18, 2015.

German-based magazine Underground Empire explained in an Instagram post that the band started later "because of a traffic jam", which then caused complaints from fans.

They signed to Dissonance Productions and changed the title of their seventh studio album to No Mercy from the Godz, which was originally due for release on October 18, 2019, with a tour to follow in late 2019 and throughout 2020.

[26] In December 2019, Agent Steel released two visualizer videos for demo versions of two new songs titled "Separation of Church and Fate" and "Way of the Mechanism".