One question that's crossed many Dragon Ball fans is why didn't the Saiyans in King Vegeta's time abuse Zenkai Boosts to overthrow Frieza? An ability that isn't as commonly talked about in Dragon Ball is the Saiyan trait to come back stronger after surviving a near-death injury: Zenkai Boost. It may not be as flashy as a Kamehameha or a Galick Gun, but without it, Goku, Vegeta, and their half-Saiyan children wouldn't be nearly as powerful as they are now.