The series takes place from 1853 to 1918.
Michael Kitchen reprised his role as Leon Trotsky on stage in Robert Bolt's play State of Revolution.
Curd Jürgens, Maurice Denham, Vernon Dobtcheff, Leon Lissick, and Michael Bryant appeared in Nicholas and Alexandra (1971), which had covered some of the same historical events.
The first BBC role of Curd Jürgens.
John Turner appeared in Rasputin (1996), which covers some of the ground as this series.