I know I have asked this question before in the far past, but since I have not been on this forum in a long time, I would like some fresh ideas on this subject: If the Yeerks attempted to invade the Earth of the Dragon Ball Z universe, how would it go? I, for one, think this "invasion" would be an Epic FAIL. For instance, every member of the Earth Special Forces (the "Z-Warriors"/"Z-Fighters") is capable of sensing Ki. Assuming the Yeerks are able to land on Earth undetected, they (The ESFs) would be able to sense who is a Controller and who is not, since the ESFs are able to distinguish between good Ki and evil Ki. Also, the ESFs would likely be able to sense their imminent arrival, before they even land on Earth. I say this because after the Garlic Jr. saga, Frieza and his father were about to land on Earth, and the ESFs were able to sense Frieza and King Cold's presence before they even crossed the perimeters of Earth's atmosphere! Also, the weakest member of the Earth Special Forces is powerful enough to... well, if he went to the Yeerk homeworld and so much as j***ed on the ground-- bye-bye, Yeerk homeworld. Bye-Bye, Council of Thirteen! There goes the head of the serpent.* Also, when they sensed the imminent Yeerk invasion, all one of them would have to do is fire an energy blast straight at the Yeerk mothership--
Earth Special Forces=1, Yeerk Invasion=0 (Actually going into space is voluntary).
*This was not intended to be an innuendo; I was thinking about the old war adage "Cut the head off of a serpent, and the body will die eventually".