The second generation Impulse was designed on General Motors's second generation R-body "world car" platform. GM had commissioned Isuzu to build a replacement for the Spectrum, this time a sportier model called the Storm (Gemini Coupe in Japan). The body design of the Storm was strongly influenced by GM and drew heavily from GM Europe's design submission for the Lotus Elan M100. Under Shiro Nakamura, Isuzu's then head of design, the third generation Gemini sedan was first designed on this platform, and then attention was turned to a sporty coupe to replace the first generation Impulse. Starting with the Storm, alternative front and rear treatments were made, retaining the lozenge theme of the Gemini sedan, and drawing heavy influence from the rear-wheel drive Impulse (semi-concealed headlights with integrated grille as well as hood and taillight styling) while also expanding on the "European look", which later became a central point of marketing the vehicle in Japan.