A Bridge Too Far tells the story of Operation Market Garden, the failed attempt by the allies to end the war quickly by securing three bridges in Holland and allowing access over the Rhine into Germany. A combination of poor allied intelligence and the presence of two crack German Panzer divisions meant that the final part of this operation (the bridge in Arnhem over the Rhine, the titular ‘bridge too far’) was doomed to failure.

Zero-X, a manned exploration mission crashes during lift-off on its maiden flight. Two years later an investigative committee finally concludes sabotage, and decides to call on the services of International Rescue to oversee security at the impending second launch. The second Zero-X successfully reaches its destination, but encounters unexpected hazards, ultimately leading to another call for assistance on its return to Earth. International Rescue respond, and once again Thunderbirds are GO!