Christine Chapel was an android duplicate of the Human Starfleet nurse of the same name created by Doctor Aaron Brown in 2268. In that year, an android duplicate of Captain James T. Kirk of the USS Enterprise replaced his counterpart on Tranquility VII and took command of the ship. The Kirk android then ordered the Enterprise to Minos V on the pretext of searching for missing colonists. In the process, the search parties - including Chapel, Spock, Lieutenant Hikaru Sulu and Ensign Pavel Chekov - were captured and replaced with androids.