…Harlan Ellison, Ursula K Le Guin, Spider Robinson, Larry Niven and the always fabulous Octavia Butler.
Harlan Ellison has been used a few times [outer limits and twilight zone…so I left him out=)] Not sure how well Spider Robinson would translate into short media [30 or 60 minute programming slot] though LeGuin has some good interesting [and creepy] possibilities=)