Rules
+ Submit a word starting with the last letter of the previously submitted word.
+ All words MUST be specifically Transformers related
+ Words may not be repeated

And example of how a word chain would work using Star Wars related words:
Lightsabre - Endor - Rodian - Nien Nunb - Barriss Offee etc.

First word:
Optimus Prime

...so the next word must begin with "E"

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Optional Parallel Sub-Game: Transformers Shiritori
I didn't think this was worth having its own thread, but for anyone game this works with the regular rules of Shiritori only with the following conditions:
1: All words must be Transformer related
2: Words ending with "n" (ン) are accepted. The preceding word must then begin with na ni nu ne or no.

Note: Shiritori is a optional sub-game. i.e. You can still play the Word Chain Game and ignore this game. Due to the relatively limited number of Japanese speakers on this board I didn't think it'd be worth having its own separate thread though.

First word:
コンボイ Convoy

So the next word must begin with イ (i).