goku will destroy the entire planet. Of course goku. And + his eyes can't do anything on him since he's too much poweful. Lol teleportation. Goku can even beat madara. And +Why would goku go against itachi? Since itachi and goku are both saving the world from the "Bad Guys". Itachi was killed by sasuke(Or you can say he let himself die and gave all his power to sasuke - If you read the truth about itachi and that it was a mission to kill all the uchihas). Sasuke now took itachi's eyes and wants to destroy konoha with the help of akatsuki.
Now, If you say Goku vs Kabuto, i'll go for kabuto since he can make people revive and control them. He will just revive Vegeta and all the others.
Now, Let's talk about Pain(Nagato). He destroyed konoha in one attack and he has the rinnengan. But he used a lot of chakra to do it. goku will just do a simple kamehameha and destroy the country. But nagato can take a soul just by touching someone and can absorb any attacks(But with a 5 seconds timeout) I say goku wins since he just has to throw little kamehamehas.
The nine tailed beast(kurama) will surely lose against goku. He will just do super sayans 4.
