Episode 20

"Cancer Cell II (Part I)" (がん細胞II（前編)) is the 20th episode of the Cells at Work! (Anime) anime adaption.

Returning characters

 * Cancer Cell
 * Natural Killer Cell
 * U-1146
 * Killer T Cell
 * Regulatory T Cell
 * Normal Cell
 * Lactic Acid Bacteria
 * Goblet Cell
 * Intestinal epithelial cells
 * AE3803
 * Platelet Division