Larry Grey (played by Charlie Anson) is a son of Lord Merton and a former suitor of Lady Sybil. He and his family are invited for a diner at Downton Abbey and Larry is very jealous over her marriage to Tom Branson. He drugs Tom's drink during just before dinner which sends Tom wild, voicing his views and making everyone, including Sybil, upset. Fortunately, Sir Anthony Strallan exposes Larry's actions, and Larry quickly disappears, and Tom is forgiven by the Crawleys, who know it was not his fault.

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