Frankie Gaines got killed in a plane crash while she and her family were flying to Los Angeles to spend their vacation. For that reason, her body was sent to a special laboratory where she was brought back to life as a robot.
Andrew Lappiere was shot and killed wrongfully by police in his own driveway. The officers just thought that he was intruding his home. They ordered him to put his hand up but just before he could, the officers opened fire because they thought he was reaching for a gun in his pocket. In spite of all that, Andrew was also sent to the special laboratory and came back to life as a robot.
Simone accidentally slipped and hit her head in the showers of her foster home. As a result, her foster parents disowned her and took her to the special laboratory where she came back to life as a robot.