Leonard Nimoy was confirmed as the voice actor for Sentinel Prime in March 2011. Nimoy, who had previously voiced Galvatron in 1986's The Transformers: The Movie and was married to Michael Bay's cousin Susan, had previously been under consideration for The Fallen's voice in Revenge of the Fallen, but Bay had been hesitant for fear of offending his relative with the relatively low pay allotted to voice actors. Even though Nimoy openly asked Bay to simply give him a call, it ultimately never worked out, and The Fallen was voiced by Tony Todd instead. For Dark of the Moon, Bay finally overcame his anxiety and hired Nimoy, who accepted the offer. In return, screenwriter Ehren Kruger included several nods to Nimoy's well-known character as Mr. Spock from Star Trek in the movie. Dark of the Moon would be Nimoy's final performance in the Transformers franchise before his death in early 2015.
Since the heavily armed Chevrolet Impalas that serve as the Wreckers' alternate modes are directly based on existing NASCAR race cars, the prop versions of Roadbuster, Leadfoot, and Topspin made an appearance at 2011 Daytona 500 at Daytona International Speedway on February 20, four month before the movie's release, appearing both off the track as display cars, and on the track, participating in the ceremonial first lap. Director Michael Bay, actor Josh Duhamel and actress Rosie Huntington-Whiteley also attended the event, and during the television broadcast of the race, a new Dark of the Moon television spot was aired. 1e1e36bf2d