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Chris Pratt, 'Everwood'
Then: A rocket scientist in the making. "Do you think if aliens would probe you, you'd still be considered a virgin?" Okay, so maybe Bright Abbott was somewhat ironically named, but despite his lack of any discernible intelligence, we somehow found ourselves charmed by his whole adorable-bumbling-idiot shtick. We were totally crushed when he broke up with Hannah, because the relationship started off with all the trappings of an epic romance. "It's like, maybe I like her. Maybe it's gas," he said. Swoon!
Now: Still a rocket scientist in the making, this time on NBC's "Parks and Recreation" as Andy Dwyer. He used to live in a pit. He doesn't anymore. He's still the kind of guy you'd expect to live in a pit, though, you know?