Ep. 48: Mari reveals Yuri's twin separation truth before Yuri returns as a Duo descendant.

48

After witnessing what appears to be Ms. Yuri’s death, Ms. Mari discloses that Yuri is her twin sister, separated during childhood. Ms. Yuri unexpectedly returns and is commanded to eliminate her sibling. She captures Misaki as a hostage, exposing her identity as a superhuman descendant of Duo, an intergalactic force imminent to Earth. Lan and the children attempt to intervene against Ms. Yuri, who utilizes a Dark SynchroChip in combat. Despite her efforts, she is persuaded to abandon Nebula. The conflict concludes with the appearance of Dark ProtoMan, who attacks and presumably kills both Ms. Yuri and Misaki.