The premise: The USSR, the United States, and other countries have set aside their differences and formed U.N.C.L.E. (United Network Command for Law and Enforcement) to fight the evil THRUSH (acronym unknown), which wants to "subjugate the human race."
The plots were much more extravagant than anything seen on Mission: Impossible, rivaling Batman in campiness:
THRUSH tries to bring Hitler back to life.
THRUSH invents a deadly hiccup-inducing gas.
THRUSH invents an exploding hula-dancing doll.
Pat Harrington, Jr. (later on One Day at a Time) steals a rare book containing THRUSH code.
Sonny and Cher play clothes designers with THRUSH code hidden in one of their dresses.
Teenage Caveman), and his partner, the Russian Illya Kuryakin (Scottish actor David McCallum). They were not only spy partners: they seemed to live together (and when traveling always took hotel rooms with just one bed). They expressed their affection with the easy nonchalance of Starsky and Hutch. And, contrary to James Bond style, they mostly ignored women.
There were lots of book tie-ins and miscellaneous toys.
After U.N.C.L.E., the two moved on to other projects, but returned to their characters in The Return of the Man from U.N.C.L.E. (1983). They are called back into service 15 years after they broke up. Dig their civilian careers: Solo became a computer developer, and Illya. . .um. . .a fashion designer.