Explorers on the Moon
Miller is the calculating spymaster from an unnamed power who masterminds the plot to hijack the Syldavian rocket programme in "Destination Moon" and "Explorers on the Moon". He was the man who offered to help Frank Wolff out of his gambling debts in exchange for information on the rocket programme: Miller is shown in one panel checking a list of personnel at the Centre and finds Wolff's name among them.