So we have talked a little about triple changers in the movies and how that might be hard to pull off in a believable fashion. but What if said triple changer had a bot mode. earth mode, and the third mode was alien to use. still had parts that were obiously part of the earth vehicle but different function. that way the third mode wouldnt specifically have to look like what we have on earth and it wouldnt have to be such a hard task to fit an additional mode to the bot.