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(covers information from several alternate timelines)
Intruder alert was an alert status on Federation starships and space stations. It could be declared at any time, by computer or any crewmember upon detecting an intruder on board. It could also be activated automatically based on predefined criteria, such as entering a restricted area. The alert was announced by audio and crewmembers were expected to take appropriate action.
In the mid-2270s, the Enterprise computer detected an intruder on deck five (the Officers' Quarters) and announced an intruder alert. Captain James T. Kirk commanded a security team to the deck, where he determined that the intruder was a probe, in the form of Ilia, sent by V'ger. (Star Trek: The Motion Picture)
In 2364, Wesley Crusher rushed to the bridge to warn of an impending intruder alert he detected while experimenting with ship's long range sensors. The warning was immediately confirmed by Tasha Yar and an audible alert over the ship's Comm. This type of alert was later referred to as a Proximity alert or Proximity alarm to differentiate an approaching vessel from a shipboard intruder. (TNG: "The Battle")
In 2369, Miles O'Brien activated the intruder alert and called a security team into his quarters when the fictional character Rumpelstiltskin appeared in Molly's bedroom. (DS9: "If Wishes Were Horses")
In 2370, Doctor Julian Bashir called intruder alert when he suffered an attack from a tentacle while in the infirmary, which, unknown to anyone at the time, was actually an out-of-control Odo. (DS9: "The Alternate")
In 2371, when the energy patterns of the Komar and Chakotay were forcing the crew of the USS Voyager to perform actions against their will, Kathryn Janeway initiated an intruder alert. (VOY: "Cathexis")
In 2372 of an alternate timeline, the computer of the USS Yellowstone declared an intruder alert and that there was an unauthorized launch in progress when Ensign Harry Kim and Tom Paris hijacked it. (VOY: "Non Sequitur")
In 2373, Captain Kathryn Janeway underwent a mind meld with Lieutenant Tuvok to try to determine the source of an apparent repressed memory. In the meld, she was sent to the bridge of the USS Excelsior in 2293 in Tuvok's memory. A disruption of the meld caused the Captain Hikaru Sulu of the memory to notice her presence and he declared an intruder alert, but she and Tuvok solved the problem by returning to an earlier stage of the memory, in which she was able to steal an appropriate Starfleet uniform to blend in. (VOY: "Flashback")
That same year, Janeway called security for an intruder alert when she discovered Q within her quarters. She received no response and Q commented that there was "no need to call for room service" as he had already ordered, indicating champagne. Janeway repeated her order for an intruder alert but again got no response and Q commented that he had "taken the proverbial phone off the hook." (VOY: "The Q and the Grey")
Also that same year, when the holographic character Marayna appeared in Tuvok's quarters despite having apparently been deleted, Tuvok called for an intruder alert, but she used her control of the Voyager computer system to silence it. (VOY: "Alter Ego")
In Lieutenant Tuvok's Insurrection Alpha holoprogram, the Voyager computer declared an intruder alert on deck 8 when the Lieutenant Tom Paris and Captain Kathryn Janeway of the program transported there. (VOY: "Worst Case Scenario")
In an alternate timeline, Neelix helped repair the internal sensors aboard the USS Voyager after they had been seriously damaged due to repeated Krenim attack. He wanted to try several variations on the audio warning for Intruder Alert sound, but security chief Tuvok ordered him to keep the standard Intruder alert sound. (VOY: "Year of Hell")
Tuvok initiated an intruder alert and called for security to deck one when the two astronauts from the planet that Voyager was trapped above in orbit transitioned into Voyager's timeframe. (VOY: "Blink of an Eye")
In 2376, Lieutenant B'Elanna Torres jokingly declared "intruder alert" when her old boyfriend Lieutenant Maxwell Burke accessed a command station in engineering without her prior authorization. (VOY: "Equinox")
|Colored alerts:||Red • Double Red • Yellow • Blue • Gray|
|General alerts:||Battle stations • "Brace for impact" • General quarters|
|Battle • Evacuation • Fire • Intruder • Perimeter • Proximity • Security • Standby • Tactical|