We love to come up with our dream casts for science fiction and fantasy TV shows and movies — but sometimes, the perfect actor for the role just doesn't wind up getting it. What's the biggest missed opportunity in casting an iconic science fiction or fantasy character?

Please include a picture, clip, poster or other image for the character, or the actor you wish had played him or her. And please mention the name of the character, the name of the actor, and why he/she would have been perfect. Thanks!

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Top image: Chris Hemsworth was just amazing as George Kirk, but I've always felt he would have been a brilliant James T. Kirk, too. He probably could have played both Captain Kirk and Thor... right?