Cross Epoch is a collaborative work between Eiichiro Oda and Akira Toriyama. It is a crossover story featuring characters from both One Piece and Dragon Ball. It was published first along with Chapter 439 in the Weekly Shonen Jump. This is the first crossover, followed by One Piece x Toriko Crossover.
The various characters from their respective series are trying to make their way to the party, hilarity ensuing from their interactions.
Mr. Satan: Mr. Satan stars in Cross Epoch as some guy who became the king of a country through Shenlong's power of granting wishes. His wish to become king using the Dragon Balls is the cause of all of the other characters traveling to Shenlong's tea party.
Pandaman: Pandaman can be seen in Cross Epoch as some random citizen celebrating Mr. Satan's rise to kingship. He is hidden in the first page behind the word panel, left of Mr. Satan.
Vegeta Sky Pirates: A group of sky pirates that star Robin, Usopp, and Trunks, with Vegeta as their captain. They all wear ancient Chinese clothes and have horns. They ride in a flying pirate ship that bears Vegeta's Jolly Roger. They were supposed to have a battle appointment with the Dr. Gero Sky Pirates but chose to attend Shenlong's tea party instead.
Dr. Gero Sky Pirates: A group of sky pirates not seen but mentioned by Trunks. The Vegeta Sky Pirates were supposed to battle with them but the former chose to attend Shenlong's tea party instead. They are apparently led by Dr. Gero.
Piccolo and Zoro: Piccolo and Zoro star in Cross Epoch as two hopelessly lost swordsmen. They apparently traveled on deer with a Richie-like lion face before boarding the Train Coaster to attend Shenlong's tea party.
Goku and Luffy: Son Goku and Monkey D. Luffy star in Cross Epoch as themselves. They used a special combo move called "Kamehame Gomu Gomu no Bazooha" to destroy the paper mache used for the Tettiri Number 55. They were the last ones to arrive at Shenlong's tea party.
Pilappaggy Villain Union: A villainous group that tried to defeat Goku and Luffy for always getting in the way of their attempts at world domination. They feature Pilaf and Buggy as their captains. They used a flying ship in a form of a giant blow fish called the Tettiri Number 55 which in reality however, is actually a small ship in the form of a bird, the blow fish shape merely being a threatening-looking facade made out of paper-mâché. They were shot down from the sky by the other characters.
Shenlong: Shenlong stars in Cross Epoch as himself. He is the one who granted kingship to Mr. Satan through the power of the Dragon Balls. He is also the reason for all the other characters traveling in Cross Epoch. He holds a tea party after granting Mr. Satan's wish on an island filled with giant desserts. His wish is to hold the party with his friends.
- In the colored pages in the end, the color scheme of the Dragon Ball characters seems to be based on the anime version rather than the manga, despite Akira Toriyama's collaboration with Cross Epoch. Bulma's hair is colored blue-green instead of purple and Shenlong is colored green instead of blue (it should be noted that both of these color schemes have been used in the manga on rare occasions, however they aren't the colors established by Akira Toriyama). Trunks' hair is oddly colored pink, despite it being purple in both manga and anime (while in the anime it is much brighter or dried).
- Pilaf and Buggy, the leaders of the Pilappaggy Villain Union, both have the same Voice actor, Chiba Shigeru, in their respective original shows, Dragon Ball and One Piece. Also, although not partnered, Luffy and Kuririn are both voiced by Mayumi Tanaka.
- Both Piccolo and Roronoa Zoro, partners in Cross Epoch, are voiced by Chris Sabat in the English dubs of their respective shows, Usopp and Kuririn are both voiced by Sonny Strait, and Sanji and Trunks are both voiced by Eric Vale.