The MIB weapons while following the lineage of the previous movies were required to not only look like the latest generation but also have a new style, one that reflected the European/English setting of this film. The production designer Charlie Wood focused initially the curved lines of classical art deco vehicles and appliances, this combined with the earlier film designs began to produce some very elegant refined looking designs. As the project developed a modern 'street" influence feed into the designs and produced the look of the final MIB weapons. The alien weapons followed a much more eclectic process, where quirky was the order of the day.
The challenge on this project was to stay true to the look and feel of the previous films but also find twist that gave the designs a feeling they were produced outside of the US MIB branch.