The story begins in some country behind the Iron Curtain. Evidence that the rightful leader of the nation was murdered and was replaced by a communist stooge is being taken out of the country by some spies. However, the secret police are right behind and they apprehend most of the conspirators...but don't manage to get the microfilm with the evidence. Soon, one of the spies comes up with an insane solution for how to get the information out to the Free World...she sticks it in the collar of a nasty black panther headed to Paris on a train. The secret police learn of this and derail the train...but the pair of panthers manage to make it to Switzerland...along with the man who was paid to escort them to Paris and then the States, Steve Quain (Howard Duff). Can the good guys manage to get their hands on the collar before the forces of evil do?
While the story was mostly interesting, there was one HUGE problem with the plot. In the story, the pair of panthers (also called pumas or mountain lions) are supposedly black. There is no such thing as an animal called a black panther and the species has never had a documented case of a dark or melanistic big cat...NONE. The writer obviously confused this with black jaguars or black leopards...which do actually exist. So, to make the story work, you need to ignore this as well as that the filmmakers actually painted a pair of pumas for the film! Poor animals...especially since something similar was done while making the film "The Beast Master"...and the paint ended up killing the tiger they painted black for the movie!
Overall, a decent time-passer...nothing more.
