Oh Crap/Live-Action TV/Doctor Who

Examples of moments in  include:

"Doctor: 'Cause this is what I'm going to do: I'm going to rescue her! I'm going to save Rose Tyler from the middle of the Dalek fleet! And then I'm going to save the Earth! And then, just to finish off, I'm going to wipe every last stinking Dalek out of the sky! Daleks: But you have no weapons, no defences, no PLAN! Doctor: Yeah, and doesn't that just scare you to death?"
 * is unimpressed with Martha's speech in "Last of the Time Lords" until she ends with "... but with 15 satellites." The resulting "What?" could easily have been an "Oh shit" if this weren't a family show.
 * From the episode "Bad Wolf": the Doctor brings down the masking signal hiding the true force behind Satellite 5, revealing . The Doctor's face says it all. And then it gets turned around in a Crowning Moment of Awesome, when the Doctor announces exactly what he's going to do about the situation:

"Nine: Look, I know Mr. Van Statten might think he's clever, but never mind him. I've come to help. I'm the Doctor. Dalek: Doc...tor? Nine: Impossible...! Dalek: THE Doctor?! Dalek: EXTERMINATE! EXTERMINATE! EX-TER-MI-NAAAAAAAATE!"
 * It continues to go back and forth in the opening scenes of "The Parting of the Ways": first the Doctor confronts the Daleks: "I'm the Doctor, and if there's one thing I can do it's talk! I've got five billion languages and you've got no way of stopping me, so if anybody's gonna shut up, it's you!"—and a Dalek actually recoils. Then, seconds later, the God Of All Daleks declares, "These words are blasphemy!"—the look on the Doctor's face as he realizes that the Daleks have found religion...
 * The Doctor gets one too when he finds out that
 * And then there's the look on face when.
 * This is likely because Dalek Caan has done the one thing that Davros had specifically designed the Daleks to NEVER be capable of:
 * The manage to provoke this expression twice in "Army of Ghosts" while having approximately ten seconds of screen time. First, the Doctor's face screams "Oh shit!" when the, then, when they actually appear, it's Rose's turn.
 * Also in "Dalek", where Rose believes they have escaped the Dalek by running up a flight of stairs. Adam mocks it and the soldier orders it to return to its cell. One word: "EL-EV-ATE!"
 * And, in the very same episode:
 * as the Dalek is revealed*

"Rose: Five million Cybermen, no problem. One Doctor... now you're scared."
 * Lacking faces, you wouldn't imagine the Daleks could pull off a decent Oh Crap moment. But in "Doomsday", when a strange man shows up on the vidscreen the Daleks are watching (and have just informed five million Cybermen that they are no threat, claiming that destroying them "is not war, this is pest control") and they demand Rose identify him, she calmly does so: "That's the Doctor." All four Daleks simultaneously jerk a few inches backwards. Rose's line is priceless:

"(The Doctor is searching through a house) Doctor: There's one more thing I cannot figure. If this room's got infostamps, then maybe, just maybe, it's got something that needs infostamping...(He opens a door and finds a Cyberman. He closes it again.) OK...I think we should run."
 * In The Macra Terror,
 * The Invasion of Time is the definitive Classic Who example. After four episodes, the Vardans have been expelled from Gallifrey through copious amounts of mind-trickery; the Doctor, supremely smug with his success, addresses the cheering crowd with a victory speech. Puzzled at why the cheering abruptly stops, he turns around... Tom Baker's boggle-eyes were MADE for moments like this.
 * The Doctor is always good for one of these. At the end of the first episode of Remembrance of the Daleks, in which the Doctor and Ace flee from a Dalek by going up the stairs, because Daleks can't climb stairs. Except, no, this one can.
 * The Tenth Doctor has managed the "Oh Crap" in the first part of each season finale, often alongside the "Wham!" part and the Crowning Music of Awesome:
 * "Doomsday":
 * "Utopia": You. Are. Not. Alone. (Along with every other character.)
 * The dovetail of "Turn Left": "Bad Wolf".
 * From Robot: "You let Sarah go somewhere with Kettlewell?"
 * "The Next Doctor":

"Master: Oh that's too simple...no no no no no."
 * The Doctor has accrued such a reputation by now that many aliens see him as a mythological figure, causing many an Oh Crap when he introduces himself. Perhaps the greatest is that of the Vashta Nerada, made all the more impressive by the fact that they can express it whilst being a shadow on the floor. "Look me up." Indeed.
 * In "The Waters Of Mars", after
 * In The End of Time, during the Hope Spot, the Doctor . The look on his face when he realises it is absolutely heartbreaking.
 * The Master gets one earlier when
 * Only fair, given the moment he gave the Doctor earlier.

"Doctor:"
 * There's also the Doctor's reaction when he realizes that . David Tennant really sells it in that scene.
 * Also, how about Lucy Saxon's reaction when she realizes that . Keep in mind,  's Mind Rape has worn off and this is
 * "Midnight". Sweet holy hell, "Midnight". When the Doctor is, confirming the Humans Are Bastards that he's been trying desperately to avert all episode, the look on his face has to be seen to be believed. Super Bonus points to David Tennant for distilling all of the Doctor's thoughts into just his face, considering he was in a state of Mind Rape and couldn't move or speak in his own voice.
 * Of course, part of the Mind Rape was that he couldn't really move his face either, so he was stuck with an Oh Crap expression the entire time. It's the eyes that made the scene.
 * Latest on the alien "Oh, crap, it's him" list is the Atraxi. After the 11th Doctor dresses them down for planning to destroy the Earth just to get an escaped prisoner, he asks them if they think the planet is under protection. Flash to a hologram showing Cybermen, Daleks, the numerous other aliens who have tried to conquer or destroy the Earth, and then a sequence showing every incarnation of the Doctor, ending with the latest walking through the hologram with a cheerful "Hello. I'm the Doctor." The Atraxi leave very quickly.
 * "Why's it pointing at the..." (lightbulb flickers) "...lights?"
 * The Doctor has Oh Crap moments often enough that the TARDIS has a standard signal for them, the Cloister Bell.
 * But only for very special Oh Crap moments. The TARDIS rings it when she detects
 * "The Time of Angels": Whilst hunting a Weeping Angel in a six-story temple full of statues, it dawns on the Doctor that-

""Oh, boll--""
 * The Slitheen at the climax of "World War Three":

"Any given Dalek: EXTERMINATE! EXTERMINATE! EX-TER-MI-NAAAATE!!!"
 * The Doctor in The Pandorica Opens, on realising that.
 * Slightly earlier in the same episode, the Doctor's reaction when River tells him the date she's been dragged to . The look on his face, and the way his voice softens for an instant as he tells her to "Get out of there now," is a suitable indicator of how real shit just got.
 * River gets a great escalating Oh Crap moment when her scanner shows the ten thousand-plus battleships in orbit around Earth. Alex Kingston does a terrific job of showing the rising Oh Crap-ness of the situation.
 * A whole crapload of the show's Oh Crap moments can be brought to mind by one simple word.

"Dalek: Mercy. River: Say it again. Dalek: Mercy! River: One. More. Time. Dalek: MERCYYY!!!"
 * And this is why, when River Song managed to give A GODDAMN DALEK an Oh Crap moment, it was terrifying. To elaborate: The Daleks have made the rather stupid mistake of . River encounters the Dalek responsible, levels her gun at him and coolly promises to shoot him right through the eyestalk. The Dalek remarks that she is an associate of the Doctor; records indicate she will show mercy. Cue River giving the Dalek the evil eye and growling, "I'm River Song. Check your records again."

"Doctor: What have you done, Lesterson?!"
 * In part six of The Enemy of the World,
 * Another Oh Crap moment from the Second Doctor is in The Power of the Daleks when he realizes that Lesterson has reactivated a dormant Dalek.

"The Doctor: ROSE!"
 * The (ninth) Doctor and Rose have just had a falling out, and he goes back to the TARDIS, to give both of them time to cool off. He opens up his little blue police box to find... . Cue Beat of sheer horror, followed by running back as fast as he can.

"Donna: No, but she said it was all worlds. Every world. She said the Darkness is coming. Even here. The Doctor: Who was she? Donna: I don't know. The Doctor: What did she look like? Donna: She was... blonde. The Doctor: What was her name? Donna: I don't know. The Doctor: Donna, what was her name? Donna: But she told me to warn you. She said two words. The Doctor: What two words? What were they? What did she say? Donna: What does it mean? Doctor, what is it? What's ?"
 * In "Turn Left", Donna is exposed to an alternate reality in which she never met The Doctor, causing the events of "The Runaway Bride" to end with him dying and everything to be a dystopia. When she breaks free and returns to the normal reality the Doctor comments that she's brilliant and she suddenly remembers that a woman from the other reality said that he had said that about her. Then she remembers what she said to her just before she "dies".

"The Doctor: It's the end of the universe."
 * His face at the mention of the Arc Words is a look of sudden realization and an OH Crap as he responds with;

": Good luck. Donna: I'm ready. Donna: 'Cause I understand now. You said, but... you mean this whole world. But that's not, 'cause a better world takes its place. The Doctor's World! And I'm doesn't answer. Donna: That's right. Isn't it? , if I change things, , that's... that's right, isn't it? remains silent until...
 * In the very same episode, as and Donna Noble get ready to :
 * One minute past ten.
 * I'm sorry."

"Daleks: Victory! Victory! Victory! (Teleports away) Amy: What just happened Doctor? The Doctor: I wanted to know what they wanted. What their plan was. I was their plan."
 * Not to mention the look on just about everybody's face, (especially Captain Jack's) when in The Stolen Earth.
 * For her part, Sarah Jane actually wobbles as if her legs are about to give out.
 * Amy and the Doctor get a shared one in the cliffhanger ending of the series 6 opener, "The Impossible Astronaut". Canton is unconscious, and a familiar, ominous astronaut is slowly approaching. Both her and the Doctor's faces when they realise what has happened embody the heck out of this trope.
 * In the second part, "Day of the Moon",
 * From the same episode, there are multiple Oh Crap moments involving the Silence: Any time someone's hand starts blinking red, indicating that they've seen a Silent but can't remember it; and the black tally marks on the characters' arms, which serve the same purpose. Amy gets a particularly effective one when she's looking for the little girl in the orphanage. She catches a glimpse of her reflection in a window, only to find that suddenly there are tally marks ALL OVER HER FACE. Then she slowly looks up...
 * In "Victory of the Daleks", the look on the Doctor's face says it all when the Daleks stop their Obfuscating Stupidity.

"Controller: The girl referred to a companion in her own time zone. She called him... "the Doctor". Dalek: Doc-tor? Did you say "Doc-tor"?!"
 * Virgin New Adventures time - The Dying Days apparently kills off within the first third of the story. Then the villain of the piece has been tricked into ranting about his plans by the Doctor's companion despite knowing full well that doing so would offend his "honour" to the point of him executing her on the spot. She gets ready for the chop when a quiet voice says "it ends now", it's a full blown "ohh crap" and "ohh hell yes" moment - as eventually the speaker reveals themselves, and you guessed it, it's the Doctor. Who is happily aboard the villain's ship and is merrily messing with everyone's plans. The stunned silence on everyone's behalf speaks volumes.
 * In "A Good Man Goes to War", it's revealed that
 * From the same episode, in answer to the question of, the Doctor gives the wonderful line
 * In "Let's Kill Hitler", the Doctor, Amy and Rory get one after
 * Another Dalek example, from Day of the Daleks. It turns out that Jo (who's been captured) wasn't working on her own:


 * The Doctor has a Crowning Moment of Awesome in The Doctor Dances intro when he defeats a child-led zombie invasion by sending the child to his room. When the Doctor investigate a private hospital's records of the child's death, they uncover a recorded interview with him and a Room Full of Crazy zombie-child drawings. The Oh Crap moment?
 * There's a similar one near the begining of 'The Girl in the Fireplace', where the Doctor realises that the clock's broken - so what's ticking?
 * At the cliffhanger of "Rise of the Cybermen", the Doctor gets a good one when he realises.
 * In "Night Terrors," the moment when the Doctor gets Alex to realize that George because  Cue look of horror on Alex's face--
 * In "The Wedding of River Song," the Doctor can be heard speaking: "Imagine you were dying and a long way from home and in terrible pain. And just when you think it couldn't get any worse, you look up and see the face of the devil himself." And then we see who he's addressing: a Dalek. Who immediately starts screaming "EMERGENCY! EMERGENCY!"
 * And those who had an Oh Crap over Ten going Time Lord Victorious will have an all-too-familiar reaction to Eleven's last words to the Dalek he murders, in the most cold sociopathic voice he has ever used: Hello...Dalek.
 * A more humourous one happens in "The Doctor, the Widow and the Wardrobe", when interrogator Droxil confidently states that she won't use her gun. She then replies "Oh really? Well, I'm looking for my children!". His expression is priceless.