In the 2008 film version, Reepicheep led two other mice into Miraz's castle during a mission that did not appear in the book.
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In Prince Caspian, Reepicheep is the leader of the twelve mice who help to fight against Caspian's Uncle Miraz in the Second Battle of Beruna, near Aslan's How.
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In That Hideous Strength, Dr. Elwin Ransom also ascends to heaven without dying.
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In The Voyage of the Dawn Treader, Reepicheep accompanies Caspian on his voyage in the hope of finding Aslan's Country at the end of the world.
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Simon Pegg took over the role for The Chronicles of Narnia: The Voyage of the Dawn Treader.
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In the movie version of The Chronicles of Narnia: The Voyage of the Dawn Treader Reepicheep likewise joins the boat's company.