Digihumans was one of the names the humans of the year 5000000000 used to describe themselves, implying they were different from the extinct (bar Lady Cassandra) humans from Earth. (TV: The End of the World) This was probably the same stage of human evolution as that referred to by the Tenth Doctor in Silo 16 on Malcassairo, when he noted that humanity had spent time as digital downloads before reverting to their basic physical shape. (TV: Utopia)