Tom Sullivan (writer), Rab Hamilton (artist)
Printed in TV Century 21 Annual 1967
Brent Cleever (Agent 21) is to help with the Planets Tour of the World President of Mars and must attend a special conference on Earth. Yet he is caught on the Earth Space Station E9 by three S.O.F.R.A.M. agents who plan to replace him with a double.
Here are the pages I have of it.