First Contact: ‘The Arsenal of Freedom’ Season 1 Episode 20

As the title reveals, this is a time travel episode, or at least it appears to be. It might be an anomaly episode too. Really it’s not very clear.

The Enterprise gets pulled into a wormhole while investigating an unusual M-Class planet and he crew are all knocked unconscious. Data informs them that they were only out for 30 seconds but some things don’t

A Romulan scout ship crosses the Neutral Zone pursued by one of their big green war ship things. On board is a defector with information about an impending Romulan invasion of the Neutral Zone. Can he be trusted? If so, can war be averted?