Question: Which person was the target of cyborg's mission to destroy?
About the article "The Terminator", section "Cast".

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  Voice Actor: Khary Payton (reprising) Stone.
First appearing in the "Deception" episode of the original "Teen Titans" animated series, Stone is the villainous alter ego of Cyborg.
With his appearance generated via holograms in his rings, Stone has two forms: the first is nearest to Cyborg's human appearance, while the other "transforms" him into a gray, granite-skinned humanoid with superhuman strength.
Stone's fictitious backstory is that he was created by a mad scientist.
Cyborg would revise this persona in the "In And Out" episode.
Upon learning of the H.I.V.E.
Headquarters' wood-burning pizza oven from Robin's recon mission, Cyborg devises the "Stone" alter ego to join Robin (who is in the guise of Red X) in the mission—and to have some pizza.
The twosome, however, get sidetracked by the arcade within the building and repeatedly delay their plans to destroy the building.
Robin and Cyborg unknowingly convince the other Titans to create villain characters of their own to join them on the inside, and the Titans become so enamored with the H.I.V.E.
Headquarters that they put off their plan for several decades.
When the Titans are exposed, they drop their alter egos and do battle as themselves, Cyborg included.
The character's name of "Stone" is derived from Cyborg's given last name: Victor Stone. 
  Voice Actor: an uncredited Tom Kenny Cyborg.
Cyborg's Nose.
In the events of "Nose Mouth," Raven is encouraged to use her dark magic for trivial reasons, which gradually brings out the darker side of her personality.
Annoyed by Cyborg's overly loud and obnoxious "BOO-YAH" practicing, Raven casts a spell that removes Cyborg's mouth, rendering him unable to talk.
To compensate for his lack of a mouth, Cyborg gradually trains himself to speak through his nose throughout the remainder of the episode.
He regains his mouth when Raven is lulled back to normal through her love of "Pretty Pretty Pegasus", and turns him and the other Titans into ponies. 
  Voice Actor: Tom Kenny Fixit.
Fixit is a cyborg hermit who has the power to control machines with his mind.
When Cyborg's power cell fails during a battle with Mumbo in "The Sum of His Parts," Fixit takes him to his underground home to be repaired.
However, his repairs are actually aimed to remove Cyborg's human parts, which Fixit believes are inferior.
After he attempts to download Cyborg's memories, he is overwhelmed by emotion in seeing Cyborg's human recollections of the world outside.
The Titans find Cyborg in time for him to explain to Fixit what it really means to be human; Fixit understands this, and Cyborg offers to help him return to a life with a more human existence.
It is unknown how this is accomplished, for Fixit makes no further appearances in the series beyond this episode.
Fixit makes an appearance in "Teen Titans Go!"
Issue #2, where Cyborg recruits him to assist the team in battling Gizmo; while at Titans Tower, Fixit combines the Titans' vehicles to create the ""Titans Go-Bot 5"."
 On Target — "Mission to the Unknown" On Target — "The Mutation of Time"  
In the aftermath of Trigon's assault in the "Titans East" one shot, Cyborg has been placed into a special hoverchair while he recuperates.
Cyborg's body is completely repaired in "Titans" #5.
Soon after, the resurrected and unbalanced Jericho enters Cyborg's body, using him to manipulate the defenses at Titans Tower to kill the Teen Titans.
Jericho's plans are foiled when Static, the newest Teen Titan, uses his electrical powers to overload the Tower's systems, causing feedback that knocks Jericho out of Cyborg.
After recovering, Cyborg pretends to still have Jericho inside of him, in order to draw out Vigilante, who was currently targeting Jericho.
The plot works too well when Vigilante appears and shoots Cyborg in the head.