One Piece Episode 1 -

: The story begins with a barrel drifting at sea being brought aboard a cruise ship by its crew.

: Luffy reveals he ate the Gomu Gomu no Mi (Gum-Gum Fruit), which turned his body into rubber. He defeats Alvida with his "Gum-Gum Pistol" technique, launching her off the ship.

: Luffy’s childhood and his meeting with Shanks are not shown in the first episode but are covered later in Episode 4 .

: In the manga, Luffy meets Alvida on an island base; in the anime, the encounter happens on a cruise ship.

While the One Piece Manga starts with Luffy’s childhood backstory, the anime chose to start with his adult journey to emphasize the pirate theme immediately.