The actor made his first red carpet appearance since announcing his diagnosis at the premiere of his new series, "Countdown."

Dane -- who shot to fame amid six seasons on the hit ABC drama "Grey's Anatomy," where he played Dr. Mark Sloan, affectionately known as "McSteamy" -- said his symptoms began over one year ago, when he began to experience weakness in his right hand.

Eric Dane walked the red carpet on Wednesday, months after the “Grey’s Anatomy” star publicly disclosed his ALS diagnosis. The actor appeared on the carpet to promote his new Amazon project, called “Countdown,” and told Variety that he was feeling “good.”