Adventure Time: Marceline Gone Adrift was a six-issue Adventure Time comic miniseries written by Meredith Gran, edited by Whitney Leopard, and published by BOOM! Studios. It originally ran from January - June 2015.
Carey was responsible for all of the artwork (designs, pencils, inks, colors, and lettering) on this miniseries. You can read a selection of sample pages from Issue #6 below, and look out for the trade paperback collection in December 2015!