to sneak around. First used in Episode 37, "White-Line Warriors". Other vehicle modes included: a two-wheel ski drive, which allowed KITT to "ski" (driving up on two wheels) on either left or right side (First used in Episode 1, "Knight of the Phoenix"); an aquatic synthesizer which allows KITT to hydroplane, effectively "driving" on water, using his wheels and turbo system for propulsion (First used in Episode 28, "Return to Cadiz"), but which was removed by the end of the episode because it was faulty; and a High Traction Drop Downs (HTDD) system which hydraulically raises KITT's chassis for better traction when driving off-road (First used in Episode 39, "Speed Demons"). Fourth season update During the first episode of the fourth season, "Knight of the Juggernaut, Part I". KITT's Molecular Bonded Shell is intentionally neutralized by a sprayed combination of chemicals, and KITT is nearly destroyed by the Juggernaut. a custom-designed armored vehicle. KITT is redesigned, and is repaired and rebuilt in "Knight of the Juggernaut, Part II". One main feature of the redesign is that Super-Pursuit mode is added, consisting of improved rocket boosters for enhanced acceleration, retractable spoilers for aerodynamic stability, and movable air inlets for increased cooling. Super-Pursuit Mode provided a 40% boost in speed beyond the car's original top speed of 300 MPH. When Super-Pursuit mode is used at night some of the exterior and under the wheel arches glow red. This also included an emergency braking system which slows KITT down from Super-Pursuit speeds, by using a forward braking booster and air panels that pop out to create air friction (air brakes). While KITT's initial roof was a T-top, the redesigned KITT now has a convertible roof. Michael can bring the top down by pressing the "C" button on KITT's dash. Screen-used cars A total of 23 KITT cars were made for use in filming the series, although speculation is that there were as many as 25. All except one of these cars survived until the show was axed; all except 5 of the remaining 22 cars were destroyed at the end of filming. This is because the series began with 5 brand new Pontiacs for the pilot presentation, and in 1982 a nearby train carrying new Pontiacs to dealerships derailed in California, and Universal Studios acquired these wrecked cars for a low price. The contract stipulated that the cars couldn't be sold again for