The acting captain's log of the USS Defiant was the method used by the acting captain to record what happened to the starship and to officially record the ship's missions in place of the captain's log. It was used by lieutenant commander Benjamin Sisko as he took the ship on a trial run. (ST video game: Legacy)
- "Acting captain's log, Stardate 45252.6. After departing Utopia Planitia Fleet Yards for a test flight of the newly completed USS Defiant, we've arrived in the Atari system to find some disturbing evidence of a Romulan incursion into Federation space. Starfleet Command has been notified of our discovery, and nearby starships are en route to our position. The Atarian nebula was chosen as a proving ground for the Defiant's trial run, because of its isolation from prying eyes. Yet, here I stare at the wreckage of a Romulan warbird well within our borders. Starfleet has been concerned with the active reemergence of the Romulan Star Empire in recent months. Their actions seem to be getting bolder with each new encounter, such as this most recent attempt to conquer Vulcan. As a matter of even greater concern, my chief engineer has informed me that upon entering Atari, our warp drive has became mysteriously inoperative. Until other Federation starships arrive, it is our duty to scout the area surrounding the nebula to determine what, if any, Romulan presence still lingers. Though this was supposed to be the Defiant's first trial run in a simulated exercise, I can't wait to see what our capabilities truly are."
- "Acting captain's log, supplemental. Our encounter with the Romulan warships has truly tested the Defiant's fledgling capabilities. While she held up under fire, I can tell her systems still need a great deal of work. After informing Starfleet of the specifics of the engagement, the involvement of the Vulcan ship in combat with the Romulans seems to have caught their eye. The Romulan commander indicated that he had been harassed by some kind of Vulcan assassin. Those two terms don't seem very likely to be used in the same sentence, but I did witness an old Vulcan ship as we fled the nebula. I intend to find out what link these separate events had in common. I know it won't be easy, but something tells me that whatever I discover. It won't be to my liking."