In 2268, the android Norman posed as a sciences division lieutenant in order to gain control of the USS Enterprise and divert it to the planet Mudd per Harry Mudd's orders. He was able to pass as a Human primarily because he avoided his required physical. (TOS: "I, Mudd" ) In 2368, a Satarran using the alias of Kieran MacDuff posed as the executive officer of the USS Enterprise-D as part of an attempt to use the starship to destroy the Lysian Central Command. (TNG: "Conundrum" )