Hudson: I got signals. I got readings, in front and behind.
Frost: Where, man? I don't see shit.
Hicks: He's right. There's nothin' back here.
Hudson: Look, I'm telling ya, there's somethin' movin' and it ain't us! Tracker's off scale, man. They're all around us, man. Jesus!
Hudson: Five meters, man! Four! What the hell?
That can't be-that's INSIDE THE ROOM!
Sometimes, the only way to keep track of objects is through crude sensors or motion-tracking devices. Such devices generally don't do much more than show some blips while making bleeping noises. Yet, this can sometimes amplify the tension of a scene, especially if the actual visual appearance of the objects being tracked is unknown. The closer the enemies get, the more rapid the beeping gets, until it becomes a maddeningly nerve-shredding screech that more often than not causes heroes to snap at just
that wrong moment before the monsters burst through and pulls him under.
A more recent usage of this trope is to have lots
of blips on the radar display, or to have a really big blip appear, as a precursor to something really bad happening. Alternatively, the blips might suddenly disappear, which is even worse for the heroes.
Naturally, this trope has some overlap with Bombers On The Screen
and Enemy Detecting Radar
Captain! The radar shows multiple incoming examples!
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Anime and Manga
- Gundam — Tends to do this by having stuff suddenly appear immediately before they come under attack. The Bridge Bunnies suddenly yelling "Heat source detected!" out of the blue usually means bad things are about to happen.
- Hanaukyo Maid Tai La Verite — Episode 10. Multiple intruders are detected, and a giant screen in the security maid's HQ shows their position as they move through the mansion.
- Macross: Do You Remember Love — The scene where Hikaru watches the radar blips representing his squadron's missiles approaching the radar blips representing enemies while his heart is pounding loudly.
- Macross Frontier — When unmanned probes are first launched to examine the Vajra threat, all that is visible is a 3D display of their progress, followed by their symbols suddenly stopping and changing to say "LOST."
- Battlestar Galactica — "We've got multiple DRADIS contacts!"
- Doctor Who:
- "Earthshock": The expedition base camp has a scanner that shows life-signs moving around in the cave system the expedition is exploring. Over the course of the episode we get dots suddenly disappearing (expedition members being killed), a dot that fades in and out (the thing that's killing them, which is alien enough to confuse the scanner), and dots suddenly appearing (the Doctor and friends arriving, just in time to be accused of the murders).
- The dragon hunt in "Dragonfire", a flagrant Alien homage.
- The Doctor's improvised motion-detector in "The Time of Angels." The blips get louder as the sound reflects off of objects in Amy's path; that she has to navigate a forest full of Weeping Angels, with her eyes closed makes it suspenseful. And then she trips, dropping the motion-detector.
- Warhammer 40000
- Ciaphas Cain — The fourth book has this, when he's in an escape shuttle that's being attacked by an Orcish fighter (since it most likely has very close ranged weapons its appearance on the pod's radar is the same as it would be for a missile).
- Space Hulk has this as a game mechanic, being heavily inspired by the Alien series. Genestealers initially appear to the Space Marine player only as scanner "blips", each of which can conceal a variable number of the aliens. The number is only revealed when within sight of a Marine.
- Alien Assault is a computer game adaptation of Space Hulk's rules with an Aliens-esque setting, and also uses the scanner blips.
- Return To The Forbidden Planet — The cast wonder whether they have detected one or two things approaching their crashed spaceship. This leads to the line, "Two beeps, or not two beeps? That is the question."
- Any modern combat flight simulator when an enemy locks onto your fighter. example Averted in any tank simulator, since tanks mostly have no way of detecting incoming fire.
- Alien Swarm — Intentionally, as one of its many Shout Out s to Aliens.
- Command & Conquer: Tiberian Sun had the Mobile Radar Array which, when deployed, could track enemies hidden by Fog of War, as well as Stealth and Subterranean units. The suspense part can even come into play with subterranean units, in that you can't tell whether what is about to pop up is a Flamethrower-tank or an APC loaded up with Cyborgs intent on murder.
- Command & Conquer: Red Alert 2 had an interesting example in the Psychic Sensor. It had a fixed range, but could detect any unit that had the intent (orders) to go into that range.
- DEFCON — The only hint of what might be really happening is the occasional sound of a woman crying.
- Defender — The scanner was just a display of colored squares. But seeing humanoid abductions — and the high price of failing to prevent them — brings on the Sensor Suspense bigtime. The Ur Example among video games.
- Fatal Frame — Whenever hunting for hidden ghosts, or whenever dealing with ghosts that like to pop up behind you or hide.
- Freespace — "Multiple incoming jump signatures, hostile configuration!"
- Half Life 2: Episode 2 in the Final for the silo, the car lights up as Strider attack from every point.
- Halo: Combat Evolved uses this in the level "Keyes". As the Master Chief proceeds through a fetid swamp and into an underground Forerunner facility, he occasionally gets unknown motion tracker blips that disappear at the range of the sensor. Finally, after finding Pvt. Jenkin's mission recorder, a whole huge mass of unknown contacts begin to smash at the other side of a nearby door...
- Later in the same level, you meet up with a squad of marines and fight the Flood in the swamp. If you get seperated you may soon find that the last green blip disappears from your sensor.
- Homeworld — Playing the game entirely in sensor mode is like this.
- Metal Gear series — You will be looking at the radar minimap quite often, and you will most definitely notice when one of the blip's vision cones turns yellow.
- Silent Hill — The radio starts playing static as dark things draw near. Silent Hill 4 instead uses this to indicate that the room is haunted.
- Starcraft II — The sensor tower, when first introduced in a gameplay demonstration, was used for this effect.
- Sword of the Stars allows you to consult the sensor display in the tactical screen to keep track of BVR enemies, but you need upgrades to actually give orders from it. Somehow.
- X-Com series allow motion detectors. A good way to avoid becoming Cannon Fodder when facing alien weapons, but since you don't know whether the blip is from alien or civilian and on which floor, dealing with the results can be... interesting.
- In Mech Commander 2 certain active enemy units are shown as blips when out of your vision range but within sensor range. Sensors do not differentiate between individual types of units, only showing Vehicles, 'Mechs and Generic. The game does alert you to 'Mechs powering up in a rather melodramatic voice.
- Marathon, a 90s FPS from the developers of Halo: Combat Evolved, also had an Aliens-style motion detector. It only detected things that were moving; an enemy that remained still was invisible to it.
- In Mass Effect 3, the planet-scanning minigame gains shades of this — you have to scan for special objectives in contested systems, but too many probes and the Reapers will see through your Stealth In Space.
- Several Shin Megami Tensei games, such as Shin Megami Tensei: Nocturne and Strange Journey, show a color-coded enemy sensor that does nothing but build anticipation: blue means everything's fine, and attacks will be rare. Yellow means there's a threat around. Red stands for "attack imminent." Sometimes the sensor will stay red for a while, especially in areas where one bad call or one bad turn at the RNG during a random battle can mean a game over, turning players into bundles of nerves.
- Strange Journey also has your HUD go off when a boss is in the area. "Warning: powerful demon detected." This actually warns you of several incoming ambushes, but it doesn't reduce the creep factor one bit...
- Jonny Quest episode "The Robot Spy" starts with a scene at an Air Force base. Radar operators watch the approach of the title device on a radar screen before calling a Red Alert.
- One can only imagine what it must be like to be a military sonar operator, or to have been a radar operator during World War II.
- In modern air and naval warfare, this is effectively all there is as the odds of seeing an enemy have massively decreased with the advent of more modern missiles. With naval vessels this has been true for several decades but for aircraft it is only since around Desert Storm that this has become true.