I think ol' Grimmy looks a he's had a bit taken out of several different IDW comics. His colour scheme and jaw look like he did in 'Maximum Dinobots' and his horns look like they were lifted from 'Monstoristy'.


Bit of a shame they are all monster looking and proportioned rather than Dino looking. I'm just hoping they aren't portrayed simply as monsters/animals in the movie, and that Optimus has just somehow tamed Grimlock to be his personal steed.