In series four, the CI5 protect the daughter of a visiting South American president after his son is assassinated, and the team uncover a silver bullion smuggling operation being controlled from behind the Iron Curtain.
4 - 1The Acorn Syndrome Sep. 07, 1980
4 - 2Wild Justice Sep. 14, 1980
4 - 3Fugitive Sep. 21, 1980
4 - 4Involvement Sep. 28, 1980
4 - 5Need To Know Oct. 05, 1980
4 - 6Take Away Oct. 12, 1980
4 - 7Black Out Oct. 19, 1980
4 - 8Blood Sports Oct. 26, 1980
4 - 9Slush Fund Nov. 02, 1980
4 - 10The Gun Nov. 09, 1980
4 - 11Hijack Nov. 30, 1980
4 - 12Mixed Doubles Dec. 07, 1980
4 - 13Weekend in the Country Dec. 14, 1980
4 - 14Kickback Dec. 20, 1980
4 - 15It's Only a Beautiful Picture... Dec. 27, 1980