The Tenth Doctor makes his penultimate appearance in Journey's End.
Alexander County is the southernmost county of the U.S. state of Illinois .. county. County ( USA ). U.S. state. U.S. state. Illinois. Illinois. As of the 2010 census , the population was 8,238 .. 2010 census. 2010 United States Census. Its county seat is Cairo .. county. County ( USA ). county seat. county seat. Cairo. Cairo, Illinois. Alexander County is part of the Cape Girardeau , MO-IL Metropolitan Statistical Area .. Cape Girardeau. Cape Girardeau, Missouri. Missouri. Metropolitan Statistical Area. Cape Girardeau-Jackson metropolitan area