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Onyx Overlord (1992-1993)
Open Space (1989-1990)
Open Space (2010-2010)
Operation Peril (1950-1953)
Operation: Knightstrike (1995-1995)
Operation: S.I.N. (2015-2015)
Operation: Stormbreaker (1997-1997)
Optic Nerve (1995-)
Optimus Prime (2016-)
Optimus Prime: First Strike (2017-)
Oracle (2009-)
Oral Roberts' True Stories (1956-1959)
Orbit (1990-1990)
Orbiter (2003-2004)
Orc Stain (2010-)
Orchid (2011-)
Order (2002-2002)
Order, The (2007-2008)
Ordinary (2014-)
Oriental Heroes (1988-1993)
Origin II (2014-)
Origin of Galactus (1996-1996)
Origin of the Defiant Universe, The (1994-1994)
Original Astro Boy, The (1987-1989)
Original Black Cat, The (1988-1992)