The Oysters are characters from Through The Looking Glass and What Alice Found Here. They appear in the poem The Walrus and the Carpenter, which was narrated by Tweedledee and Tweedledum in Chapter 4.
Through The Looking Glass
The Oysters first appear in Tweedledee and Tweedledum's poem The Walrus and the Carpenter. In the poem, the oysters got deceived by the Walrus.
The Norman Z. McLeod film
The oysters here are minor characters. They only make a brief appearance in the film.
The Walt Disney film
The oysters here have a scene appearance in the scene The Walrus and the Carpenter. All the oysters are attracted by the Walrus. Soon, the Carpenter built a shack. However, when the carpenter made stew and bread, the Walrus ate most of the oysters, except their mother. This caused the Carpenter to get angry and chase the Walrus away.
The Oysters later reappear in the reprise of the song Caucus Race.
In the anime
In the anime series, the Walrus and the Carpenter do not eat the Oysters. Instead, they get trapped in cages. Fortunately, Alice finds out about the injustice and help in the episode The Oysters' Release.