Dennis Quade as a medeval knight in Dragonheart. His accent was even worse than Costner's in Robin Hood.

The sean connery thing in Highlander never bothered me, anybody whos been around for 2500 years has lived enough lives to change dialects like a a translator changes languages...plus in all honesty he was a mess which is the point always though they were goin for being so worldy.

Joseph Gorodn-Levitt played Cobra Commander. A sweet guy and a good actor who, unfortunately, is about as menacing as a box of kittens.

And I'd completely forgotten about Elizabeth Shue in The Saint. Definitely Christmas Jones territory there!

I can't believe you all missed Arnold as Mister Freeze!  Actually that whole movie was miscast... 

What about Rosie O'Donnel as Betty Rubble..? That is THE worst casting choice of all time. Betty Rubble was supposed to be the hot one and they put that fat piece of shyt in there...

I know Sue Storm, and you Jessica Alba are no Sue Storm.

 You forgot to mention Robert DeNiro as Frankenstein's monster...

I'm surprised no one has nominated my boy Keanu Reeves in Chain Reaction.

Connery was miscast as Ramirez??? *LOL*

He's one of the most memorable and endearing characters in the "Highlander" franchise. Who gives a shit about whether his accent fit or not...

I forgot to add another note here. Wise, you're right about Keanu and that ubsurdity called Chain Reaction. However, I may have one that equals that if not beating it. What about Keanu in Bram Stoker's Dracula? If that wasn't miscasting at it's finest, I don't know what is!