I'm assuming that due to his damage in the first movie, he lost his ability to fly as a Cybertronian jet. Then he was dumped in the ocean along side his fellow decease Decepticons, which included Brawl/Devastator...so maybe he repaired himself using parts of Brawls body, namingly the tank treads and the tank torrent. Then again, Bay-Formers can 'morph' themselves at will (like BB did) to become any alt mode they choose of equal mass, so it's not such a hard stretch.
P.S you noticed i said Bay-Formers. Real TF's can't do that. It's a stupid ability imo, ala Mr.Bay.![]()

Nelson has posted this over on SFTE...
They scan vehicles. That's what Teletran 1 did in the cartoon. The only difference is that they can do it themselves. I don't see the problem.
Oh, wait, I forgot. Everything has to be exactly the same as the cartoon.![]()
No, everything doesn't have to be exactly like the cartoon. It'll just get too muggled if a TF can change is/her alt mode at will. I mean, what's to stop them changing 3-6 alt modes within 1 movie, as they see fit.....
Energy.
One would think that it would take a good amount of energy to change more then needed..
Which would make sense if the movie didn't seem to convey the idea that their power supply is either limitless or not much of a concern... unlike the original story, where their need to harness energy was a major crux to the story.
Also, the reason for Teletran 1 made perfect sense. It would take a supercomputer with way more processing power than your average Transformer to scan and understand the working of their alt-modes. If each robot had that know-how not only would they ALL be geniuses but they wouldn't even need a "medic" like Ratchet in the first movie because they were all already doctors/mechanics.
Among the equipment the movie is using in this desert sequence alone: two A-10 Thunderbolt II "Warthog" tank-killing jets; six F-16 Fighting Falcons; 10 armored Humvees; the Army's Golden Knights parachute team; two Abrams tanks; two Bradley tanks; two missile-launcher vehicles; two armored personnel carriers; and a quarter-mile of the missile testing range, cleared of unexploded ordnance and built into an Egyptian town and temple. (Signs warn not to cross a perimeter just over the gypsum dunes, because live bombs could be hidden in the sand.)
Which would make sense if the movie didn't seem to convey the idea that their power supply is either limitless or not much of a concern....
Also, the reason for Teletran 1 made perfect sense. It would take a supercomputer with way more processing power than your average Transformer to scan and understand the working of their alt-modes. If each robot had that know-how not only would they ALL be geniuses but they wouldn't even need a "medic" like Ratchet in the first movie because they were all already doctors/mechanics.
Yep. Scanning alt modes at will, or as it's listed 'Morphing' is a cheap cop out of a plot device.
And to sto_vo_cor_2000:
As CFlash mentioned, there is no indication that Bay's TFs actually run out of energy, or what their energy source is.
I would assume that their 'spark' is their energy source, and therefore, as long as it's running they can operate at full capacity.
BB changed alt mode to demonstrate a mere fashion statement;
there was no indication by any of the Tf's in the movie that they were in short supply of a power source, especially being so far away from their home planet.
USA Today article:http://www.usatoday.com/life/movies/news/2008-12-28-transformers-side_N.htm
Nothing too intresting except this:
Some of the most important newcomers are in the robot cast: Decepticons Soundwave, a fearsome communications expert, and Devastator, whose arms and legs are built out of other Transformers. And on the Autobots' side is Jetfire, a villain whose age and broken-down physicality leads him to help the Autobots.
that FAB fig pretty much confirmed that design. All we can hope for now is that it'll look better on screen.

Damn it! Whichof the designers when they were going through the possible JetFire pictures said "THAT ONE!THAT BACKPACK THING!!!I WANT IT!"that FAB fig pretty much confirmed that design. All we can hope for now is that it'll look better on screen.

This time, the story finds Sam and Mikaela under attack by the evil Decepticons because of something Sam has learned about the origins of the Transformers and their ancient history on Earth.
I could be new to the TF: ROTF party, but this is new to me. How does Sam learn from it?
From the All Spark?
Hard to say.
The prevalent theory is that the All Spark somehow did it when he did what he did to Megatron. This is why Megatron can't kill Sam, and why they're after Sam without trying to kill him.
Either Sam retained some part of Megatron's spark and he's needed alive to resurrect him, or he has some knowledge somehow that's essential (defeating the Fallen; resurrection info; etc)
Sam starts acting like his grandfather did, going crazy, drawing symbols, etc. Archibald had direct contact with Megatron, as did Sam, so there's that common link. It may be a side-effect of close proximity to the All Spark, since Sector 7 always had protective gear when utilizing it.
Recall when Simmons scanned Sam and his house.. there was a lot of residual radiation (presumably).. and with Sam being around them the most, it makes sense that he stats going nuts if it's due to some radiation given off by the All Spark and/or Transformers.
Alternately, there may be an outside 'force' calling to Sam. Sort of like the Silver Surfer being a herald of Galactus. If the tube pic is a frozen robot head, I'd imagine that's the herald of the Fallen calling out.
BB changed alt mode to demonstrate a mere fashion statement;
Which really proves nothing.