Mark HartzellMark Hartzell Selective FilmographyLost in Space(2018)EditorEditor (3 episodes, 2018)Agent Carter(2015)EditorEditor (4 episodes, 2016)The Day the World Ended(2001)Editorial departmentAssistant editorSmallville(2001)Editorial departmentAssistant editor (7 episodes, 2001-2002)She Creature(2001)Editorial departmentAssistant editorDark Angel(2000)Editorial departmentAssistant editor (8 episodes, 2000)(*) uncredited