with Joanna, Dr. Caroll uses a neurodrive to extract Zeigler's data from Joanna's memory, which she gained when she rescued her father. Chandra then shoots Dr. Caroll, revealing that she decided to join dataDyne because Zhang Li had made her a large offer. A team of Carrington Institute agents saves Joanna, but Chandra ultimately escapes with the data. When Joanna agrees to join the Carrington Institute to stop dataDyne, Carrington explains that Zeigler had been working on an algorithm capable of decoding extraterrestrial glyphs at a dig site in South America. Traveling to Peru, Joanna learns that the glyphs are leading dataDyne to search for an ancient artefact which acts as a power source for the Graal, a device which endows individuals with superhuman powers. Joanna plants a tracking device on the artefact before sneaking aboard a dataDyne dropship. The dropship takes her to Africa, where Zhang Li has located the Graal buried under the African sands. As the Carrington Institute starts an offensive on dataDyne, Joanna rescues several Carrington Institute agents before avenging her father's death by killing Mai Hem. She then infiltrates an arena and faces off against Zhang Li, who dispatches Chandra after using the Graal. After Joanna defeats Zhang Li in a final battle, Carrington commends her efforts, saying she did "Perfect". Development Development of Perfect Dark Zero began on the GameCube with a very small team of roughly ten people. At the time, Nintendo had a 49% stake in Rare, making the company a Nintendo second-party developer. According to lead designer Chris Tilston, "it was basically prototyping, finding out where we could go and how we could get there". When Rare was purchased by Microsoft in 2002, the project was transferred to the Xbox console and the game's multiplayer mode was redesigned for Xbox Live online play. Tilston revealed that at one point they got to 50 players online simultaneously, but the graphics "just couldn't handle it". Since the initial version of the game pushed the original Xbox hardware "pretty hard", the project was ultimately transferred to the Xbox successor, the Xbox 360. Tilston revealed that the original Xbox version was "about 12 months away" from completion when the shift occurred. Initially, the game had a heavy anime style and Joanna Dark received many alterations throughout the development process. Lead Art Director Wil Overton explained that they "wanted to bring her back in line with