In ROTF, there is a clear mention of Sentinel Prime. But what I just noticed was that it was in the context of the phrase "Sentinel Prime Expedition". Sam was talking about a mile a second, so I couldn't make out the vast majority of what he was saying. This was in his classroom mental breakdown. All I can decipher is that it is a theory of energon, something to do with interdimensional energy harnassing, involving the physics of our universe as defined by Einstein, blah blah. But what interests me is the word "expedition" - that, and several other snippets of information we have received. 1. The guard and other sources claim that the big firetruck is Sentinel Prime. 2. The Q/Wheeljack character, presumably, has a face modeled directly on Einstein - could this be some sort of deliberate allusion on the part of the character, perhaps a form of honoring Einstein? 3. These ramblings about the need for/creation of energon, present in ROTF and likely to be a subject in TF3, include allusions to both Einstein and the Sentinel Prime Expedition. If the firetruck really is Sentinel Prime, then we can establish continuity between this and ROTF, even if it was just a blurb from Sam. Could it be that the Sentinel Prime Expedition discovered a method for creating energon, and that this expedition includes Wheeljack as its scientist, Sentinel as its leader, Hot Rod as its enforcer? Just a thought.