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.
Funimation is streaming it to viwers in the US and Canada where Aniplex USA holds the streaming rights.
The series has its thirteen-episode broadcast run available in its original Japanese as well as the English dub.