S1, E5: After Black King and Nackle Bandero attack a test facility to obtain Spark Dolls, Rui unwittingly accompanies them back to planet Guillermo and Ultraman X must team up with Ultraman Zero to save her.

S1, E5: After Black King and Nackle Bandero attack a test facility to obtain Spark Dolls, Rui unwittingly accompanies them back to planet Guillermo and Ultraman X must team up with Ultraman Zero to save her.