The Japanese cast includes Tomoaki Maeno as White Blood Cell (Neutrophil), Kana Hanazawa as Red Blood Cell (Erythrocite), Kikuko Inoue as Macrophage, Daisuke Ono as Killer T Cell, Maria Naganawa as Platelet, Takahiro Sakurai as Helper T Cell (T Lymphocyte), Saori Hayami as Regulatory T Cell, M.A.
The dub has Christian La Monte directing it and the main cast includes Cherami Leigh as Red Blood Cell, Billy Kametz as White Blood Cell (Neutrophil), Robbie Daymond as Killer T Cell, Laura Post as Macrophage, Xanthe Huynh as Platelet, Griffin Burns as Dendritic Cell, Erica Mendez as Regulatory T Cell, Ray Chase as Helper T Cell, Kayli Mills as Eosinophil, Morgan Berry as NK Cell, and Erik Kimerer as B Cell.
The series has its thirteen episode broadcast run available in its original Japanese as well as the English dub.
The series was directed by Kenichi Suzuki based on the series composition by Yuuko Kakihara.