Michael C. Hall will spend much of 2021 in killer vigilante mode as he films the hotly anticipated revivalof Showtime’s “Dexter,” due out this fall.

Hall’s first order of business this year, however, is a more personal affair. For more than three years, the seven-time Emmy nominee has been the lead singer of Princess Goes to the Butterfly Museum, an experimental rock trio based in New York. The band’s first full-length album, “Thanks for Coming,” was released Friday.