Castor, the Twin is the second studio album by Dessa, a member of Minneapolis indie hip hop collective Doomtree. It was released by Doomtree Records in 2011. The album features new arrangements of her previously released songs. The original production has been replaced with live instrumentation on piano, vibraphone, mandolin, viola, double bass and timpani. The final track "The Beekeeper" is an advance single from Dessa's 2013 album Parts of Speech.