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What actors do you think performed best as other characters? Some actors can’t seem to pull it off, while others are absolutely convincing as another character on their show. If done right, these can be some of my favorite episodes. Done wrong, and it’s just embarrassing.

My favorites are:

John Glover as Clark Kent in “Smallville”
John Lithgow/Kristen Johnson as Sally/Dick in “Third Rock From the Sun”

And my new favorite:

Adrian Pasdar as Sylar in “Heroes”. The moment Adrian came on I knew he was Sylar. He had Zachary Quinto down. He even said Mohinder in that weird way that Zach always does.