Vegeta, Dragon Ball and Daima

The series received a major development in Episode 18 when Goku achieved his long-awaited ... a possible Super Saiyan 4 transformation for Vegeta and his future path through the story.
Vegeta using this new form as a surprise to Goku and the others, but Bulma had known all about it. Not only did she reveal that Vegeta had been training in secret, she was proud of seeing this ...