cross epoch
A collaborative work between manga authors Akira Toriyama and Eiichiro Oda. It is a one-shot crossover featuring characters from their respective Dragon Ball and One Piece series. Released on December 25, 2006 in the 2007 #4/5 issue of Weekly Shounen Jump.
Shenron, who has just granted Mr. Satan's wish on the Dragon Balls to become a king, has invited his friends for a little get-together. The various characters from their respective series are trying to make their way to the party, hilarity ensuing from their interactions.
(Summary taken from the One Piece wiki)
External links:
Dragon Ball wiki: Cross Epoch
One Piece wiki: Cross Epoch
