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Clay has discovered the third dimension location of her older sisters Washu and Tsunami. It is here that the events of OAV 2 Ep. 5 (episode 12 overall) where Tenchi Masaki uses his own lighthawk wings to overcome a black hole are noticed, as is the uniqueness of Tenchi's power. Knowing that Z would likely challenge Tenchi, Tokimi orders him to not touch Tenchi. This is re-enforced with a warning from D3. He decides to obey the letter of the order... but not the spirit of it, and he tampers with a communication from Galaxy Police Officer Mihoshi to her family, he sets in motion a chain of deadly events that make up much of the story of the third OVA series.

When his attempt to manipulate Mihoshi's brother Misao into killing Tenchi fails, Z attacks Tenchi directly in an attempt to eliminate him. In his mind, he's doing Tenchi a service since he knows that Tsunami and Washu will bring him back to life, only he will no longer be a freak of nature with unnatual abilities. In the process, Z destroys much of the Earth and when testing Tenchi's material conversion abilities, destroys a large section of the moon. Since Tenchi only displayed three lighthawk wings, Z canceled them with three of his own, leaving him with two and Tenchi with none. He attempts to kill Tenchi, but Tenchi manages to flee to Saturn.

To stop Tenchi, Z has pulled from the future the entity known as the Counteractor, who also happens to be Empress Misaki. Seeing this, Tokimi finally made a direct attempt to stop Z. However, Z overcame her efforts with the help of the Counteractor at great cost to himself. He attempts to again kill Tenchi which causes Sasami to become Tsunami. Tsunami and Tokimi's powers react to each other, causing much of the galaxy was ruined. Washu, who had resumed her Chousin form, put an end to it and focused her sisters' attention. Z explains things to Tenchi, including the story of Z's past. Ryo-ohki attacks Z and is destroyed. Ryoko then attacks Z to save Tenchi.

To prevent her from being killed, Tenchi overcomes the Counteractor and places himself between Z's lighthawk wings and Ryoko. Tenchi is sliced open by Z's lighthawk wings, however, instead of dying, a huge burst of energy emerged from the wound. Z was easily destroyed by this surge of Tenchi's power. Z had been so blinded by hatred and anger at what Tokimi (and indirectly Tsunami and Washu) had done to him, combined with his jealousy of Tokimi's clear interest in Tenchi that he failed to notice that even after eliminating Tenchi's lighthawk wings, Tenchi still survived in the cold vacuum of space.

Later, when the Chousin had explained what had happened, Tokimi realized that had she done things differently with Z, she might have had a relationship with him that was similar to the one Tsunami and Washu had with Tenchi. She then recreated Z as an infant and sent him back into the past. Because Choushin cannot re-create the power he once had, Z will now lead a life as a normal member of his race, and hopefully a better one. (source: Wikipedia)