Experiments are underway to find the means for Xio officers to turn monsters into Spark Dolls. The monster Black King strikes, with Daichi and X uniting to fight it, but the Alien Nackle, Bandello, uses this opportunity to steal the Spark Dolls from Asuna and the others. Ultraman Zero then makes a shocking appearance! The Alien Nackle, realizing his disadvantage, takes Rui hostage and escapes to a distant dimension. To save Rui, X and Zero must team up!
