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Dan's wife and mother of their son Zack. She is the only one in the present who knows what is going on with her husband's time-traveling. Katie was the long-time girlfriend of Dan's brother Jack but after their break-up nine years ago have remained somewhat distant, partly because Katie ended up getting pregnant by Dan and they married soon after. Katie always feels second best to Livia Beale, Dan's deceased ex-fiancée, who she views as the love of his life. At the end of third episode, she finds out that Dan has seen Livia when she discovers a watch inside a jacket left by Dan inadvertently.

(wikipedia.org)