Given how this series distinguishes itself by being primarily rooted in science instead of science fiction, I was pleasantly surprised by the extraterrestrial direction.
Among all the aliens and deep story, Wallace manages to retain Holt’s personality throughout this two book arc. One instance that this was explicitly shown is when Holt himself admitted that he should have expected being betrayed by the Kryl and that his scientific curiosity got the better of him which I would think that most readers can relate to. Furthermore, Holt manages to shows off his witty side in the midst of all the danger, allowing for deeper insight into the character and development of his personality.
Wallace did a phenomenal job in partitioning this two book arc with the first book dealing with breaking out from the prison and the second focusing on delivering hardcore action sequences that displays the versatility that this series is capable of. Along with referencing the archaic notions of human slavery which humanizes the extraterrestrial nature, the arc further dabbles with the concept of racism due to the entrance of Py’lothia, an anomaly of Cepniac’n race. It ultimately serves as a profound reminder as to the extent that humans have evolved over the centuries. I do believe that it also translates to the LGBT issues and touches on people who struggle from being different with parents who cast them out just for being different than the social norm. Acceptance and love are power things.
While this arc does deal with more science fiction elements, bringing in the concepts that humanity has struggled to deal with certainly adds a different dimension that I was not expecting, thereby making it one of the more enjoyable and exciting arcs in the New 52.