Boss 8: Beerus

Beerus

Now that Goku is the strongest on planet earth, formidable in the underworld, superior than any deity, guardians and protectors of the universe, who else should he face but the God of Destruction of the Seventh Universe himself. Enter Beerus who reveals to Goku that there are 12 universes altogether with beings far, far stronger than him.

Unlocked Whis

Whis and Beerus
This time though, the taller one IS the strongest between the two

It is after meeting Beerus, that Goku seeks to unlock his Super Saiyan God form through fusing his powers with four other Saiyans. Ofcourse, despite his Godlike powers, Goku’s ego is shattered by Beerus. And this is where it gets crazy as according to the manga, Beerus’s attendant, Whis, is way stronger. Goku’s rise to Godhood is also symbolically depicted if one pays attention to the ‘kanji’ on his uniform. In Dragon Ball Z: Resurrection ‘F’, Goku and Vegeta sport Whis’ kanji on their respective uniforms, confirming that they are indeed being trained by the latter