He's enjoying mainstream success as the star of ABC's Castle, but Nathan Fillion is still a fanboy favorite — and a fanboy himself. So the Firefly and Dr. Horrible alum totally geeked out when he was offered the voice role of DC Comics superhero Green Lantern in the DVD movie Green Lantern: Emerald Knights, due June 7 from Warner Bros. Animation. Emerald Knights is a series of vignettes about the Green Lantern Corps, an intergalactic police force. Fillion plays Hal Jordan, the Green Lantern of Earth's space sector, who mentors Arisia, a new recruit played by Mad Men's Elisabeth Moss...
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