Professor McMoo is a very clever cow - so clever, in fact, that he has managed to build himself a time machine from discarded farming machinery. He and his two cow friends, Pat and Bo Vine live on the Barmer farm, in fear of the hideous farmer's wife, Betty. But they are also star agents of the CIA - Cows in Action, a crack team of cow commandos! In the future, cows live peacefully with humans as equals, not as food. But some cows in the future try to use the technology of time travel to interfere with history - and the Prof has to help stop that! The CIA are going to war! The Time Shed has been blown up in the Blitz, and so McMoo must parachute behind enemy lines in search of a captured scientist who can help repair it. The agents have to work together to take on the enemy in an air battle and make sure that the course of history runs smoothly.