Shizuka-chan Disappeared!? (しずかちゃんが消えた！？ Shizuka-chan ga Kieta!?) is an episode from the 2005 anime series.
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Nobita goes to Shizuka's house to give her a gift for her birthday, but he ends up taking the wrong box. The box he takes is actually Doraemon's gadget which transforms people into animals. When Shizuka unknowingly drinks it, she turns into a cat, and none of her friends can recognize. Gian, thinking she is a stray cat, puts her outside and shoos her away. Later they realize the cat was Shizuka and they go out to find her, but in this time Shizuka has already made a new friend.