Episode 12

New characters

 * NT4201

Returning characters

 * AE3803
 * AA5100
 * Killer T Cell
 * U-1146
 * Eosinophil
 * Platelet
 * Dendritic Cell
 * Macrophage
 * Mast Cell
 * B Cell
 * Memory Cell
 * Regulatory T Cell
 * Helper T Cell
 * Naive T Cell
 * Basophil
 * Pseudomonas