Honestly, I don't really see why Terratron is necessary beyond "I made my characters be from this planet so I could have them be special triple changer dinobots instead of regular cybertronians". They're your characters, you can do whatever you please, but I don't really want to play in a game where this planet and characters from it will feature heavily in the plot, and since I'm always iffy about people playing canon characters, especially important ones like Optimus and Megatron, I suppose I'm out.