The Operation Phoenix Trilogy is a three part mini series in the Casefiles series, that ran from June 1992 until August 1992. Like the rest of the Casefiles, it was produced by Mega-Books and published by Simon & Schuster's Archway Paperback imprint. The three titles in the trilogy, Endangered Species, No Mercy, The Phoenix Equation, are also books #64, #65, and #66 in the main Casefiles series.