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This article is about the episode, for details about the fourth Protocol, part of the system of rules, see Protocol 4.

Protocol 4 is the second episode in the second season of Travelers. It first aired on Showcase on October 23, 2017. The episode was written by Ashley Park and directed by Andy Mikita.

Summary[]

For a complete plot of Protocol 4 (episode), go here.

Philip makes an unexpected connection, Marcy helps David cope with his trauma, and MacLaren discovers a shocking truth that Kathryn has been hiding from him.

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