vegeta beating goku, must be a prallel demension
Actually, it's under the assumption that Vegeta battled Goku after coming out of the Time Chamber. Super Vegeta vs Super Saiyan Goku. At the moment that Vegeta had come out of the Time Chamber, he was stronger than Goku. Goku surpassed Vegeta again after he went in the time chamber though.
Okay, but why?