The Plunderer gets his hands on Ka-Zar's half of their father's medallion and uses the mystical Plunder-Stone to start taking over the world. DD gets in the way and helps take the would be world conqueror down. Foggy and Karen show up in England to defend Ka-Zar against trumped up charges his brother brought against him.
in The Mighty World of Marvel (Marvel UK, 1972 series) #90 (June 22, 1974) [pages 1-10], #91 (June 29, 1974) [pages 11-20; page 1 of the reprint is a paste-up of the Plunderer image from page 10, panel 3 and a Daredevil figure from an as yet unknown source]
Letters from Peter Kerns, Danny Dowell, Mrs. Peggy E. Ryan, Bill Sims, Dennis Allard, Joseph Guidera, A.J. Melch, Paul Laginess, Steven Schaffer and Ricky Luquette.