"2268: Following the encounter with the mysterious Gary Seven in the twentieth century, the crew of the U.S.S. Enterprise is startled by two intruders who have transported through space and time from Earth circa 1968. Incredibly, one of the infiltrators is a Vulcan, who asserts that he’s lived among Earth’s population for over a decade. The other represents a little-known race, and reveals to Captain James T. Kirk that she has spent the last twenty years working to bring about humanity’s destruction. It is then that Gary Seven’s young protégée, Roberta Lincoln, arrives seeking Kirk’s help. . . ."