Firefly #31 was published by Boom! Studios on July 1, 2021, as part of a series that began in 2018. Greg Pak writes, and art comes from Bengal, Brad Anderson and Francesco Segala. This 28-page issue features Malcolm Reynolds, Zoe Washburne, River Tam, Kaylee Frye and Jayne Cobb, among 11 characters cataloged on VerseDB.