His first Star Trek covers were for IDW's first Trek miniseries Star Trek: The Next Generation: The Space Between. Howard created a cover for each issue which were used as limited availability retailer incentives, his cover for the third issue was not used.
Howard's second set of covers were for the Alien Spotlight miniseries. For this series Howard's covers were used as one of the two widely available covers for each issue. Most recently Howard has contributed covers to IDW's Star Trek Omnibus series.
Star Trek covers
|Star Trek: The Next Generation - The Space Between|
|Issues||History Lesson • Captain's Pleasure • Strategy • Light of the Day • Space Seeds • An Inconvenient Truth|
|Creators||David Tischman • Casey Maloney • Leonard O'Grady • Robbie Robbins • Aaron Leach • Stacie Ponder • Neil Uyetake • Chris Mowry • Dan Taylor|
|Cover artists||Dennis Calero • Zach Howard • Jeremy Geddes • Thompson Knox • Ken Kelly • Joe Corroney|