The series is being extensively "refreshed" for Japanese television. This is not a new animation, but rather a remastered edit that runs through certain events of Dragon Ball Z. Part of this is reformatting and extending the picture to 16:9 Widescreen. Through digital processing, the image is made vibrant. All the grime, damage and noise remaining on the "Z" film is removed, making the image much clearer in high-definition.
New ending credits with new animations of Dodoria and Zarbon (top left), The Ginyu Force (top right), Frieza (center left), Raditz (center right), and Vegeta and Nappa (bottom left).
A comparison with the original video side-by-side shows considerable cropping to achieve the 16:9 aspect ratio. However, it seems carefully done to avoid missing anything important. The original image is not stretched, just cut where it would be more appropriate, being a "tilt and scan" or "reverse pan and scan" of the original Dragon Ball Z footage.
Dragon Ball Kai includes a complete re-recording of the dialog by most of the original Japanese voice cast, as well as completely new sound design with updated sound effects. The opening and ending themes are completely new. Takayoshi Tanimoto performs the series' new opening and closing themes, "Dragon Soul" and "Yeah! Break! Care Break!". This new opening and closing credits have newly animated appearances by most of the main cast, as well as for the villains, such as Raditz, Nappa, Vegeta, Frieza, Zarbon, Dodoria, and The Ginyu Force. There's also a new artwork clip after every intermission, such as one of Cui and Vegeta in episode 19. Unlike the original Dragon Ball Z, which only had 2 sets of eye-catchers for the entire series, in Kai it changes every few episodes to feature an appropriate character ensemble/situation.

Series information Dragon Ball Z Kai

The Galic Jr. Saga will also not be airing in Dragon Ball Kai. Originally lasting from episodes 108 to 117, the saga featured the return of Garlic Jr., the main villain from the first movie. The saga was completely filler and Garlic Jr. or any of his henchmen did not appear in the original manga. Because Kai stays truer to the manga, this saga has been completely cut out.
For the Androids Saga, the animation in the opening scene and closing credits has been altered a bit to fit the current storyline. New animations of Dr. Gero, Android 19, Android 17, Android 18, Android 16, and Cell appear, as well as the Super Saiyan appearances of Goku, Vegeta, Future Trunks, and Gohan. The new intro also showcases battles taking place within the saga, such as Vegeta vs. #18, Piccolo vs. Cell, Goku vs. Cell, and ends showing a sequence of the Z Fighters

The Dragon_z is a standing together with their Cell Saga appearances. The ending credits are also different, showcasing Goku flying with Shenron as the faces of the main cast appear. He proceeds to transform into a Super Saiyan and the cast joins him in flight. The sequences ends with the Z Fighters standing in front of the Earth, with Shenron and Porunga in the backdrop.

Toei released the first set on DVD and Blu-Ray in September, 2009 in 4:3 aspect ratio, which is said that is how it was originally created and was only 16:9 ratio before because it cropped for HD TV.

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