The mighty green warrior Tars Tarkas was ready for blood the day he first met John Carter on Barsoom. Make that MORE blood. The epic, “Shell Shock,” chronicles the violence and horror that led to that day. Tars Tarkas is jolted out of an existential crisis by the massacre of a Thark egg incubator, and things just get worse from there as he faces mutiny and … and genocide! Written by Mark Rahner (“Rotten,” “Green Hornet” Annual #2).