Even though the original show went off the air over a decade ago, fans can’t seem to get enough of Serial killer Dexter Morgan. Luckily for them, the hit show is coming back via the upcoming Dexter: Original Sin prequel. Even more exciting is that some early details have been revealed about the show, including its cast, plotline, and even a first look at everyone’s favorite killer. Related | Dexter: New Blood ending explained Dexter prequel show cast and charactersShadow and Bone alum Patrick Gibson will play Dexter in the prequel series, set 15 years before the events of the original show. Ot…