Will Arnett was supposed to be KITT's voice on the "Knight Rider" revival. But there was a problem: he is usually known as the voice of GMC Trucks, while the NBC's new "Knight" is "played" by a Ford Mustang. Reason why GM asked Arnett to pull out and KITT's new voice will be Val Kilmer.

Arnett ("Arrested Development") had already completed his part for the pic, which is slated to debut on NBC in less than two weeks. Producers Doug Liman, Dave Bartis and Dave Andron -- along with the network and studio -- were all fine with his performance.

The problem was that Ford will not only provide cars for "Knight Rider." It's taking an active role in the marketing and branding of the pic, a backdoor pilot for a possible series. Ford's logo even appears all over NBC's on-air promos for the pic.

"I was very excited at the prospect of playing the part of KITT in the new 'Knight Rider' movie," Arnett said. "However, because of a long relationship with General Motors as the voice of GMC Trucks, I had to respectfully withdraw from the project."

In addition to his roles in pics such as "Batman Forever," "Heat" and "Top Gun," Kilmer has done plenty of voice-over work, including the voice of Moses in 1998's "The Prince of Egypt."

.