RIP Leonard Nimoy( Sentinel Prime)
http://www.nytimes.com/2015/02/27/arts/television/leonard-nimoy-spock- of-star-trek-dies-at-83.html?_r=0
For my money Nimoy's Sentinel Prime is the best villain in the series to date, he was ruthless, cold, and didn't take crap from anybody, but he wasn't all wicked...He just saw that there was no chance to win the war and had to form an allegiance with Megatron to help save their race.
Also had the best foreshadowing, too, at the beginning of the movie when Wheelie watches the Star Trek episode where "Spock goes nuts".
RIP.