A type of Mook that patrols around a certain area, alerting its allies if it spots something suspicious or an intruder. In stealth games, these sorts of enemies must be evaded, knocked out, or killed in a certain way lest other mooks discover their downed ally and/or the player or even cause a game over. Compared to regular Mooks, they can be nearly the same except having equipment used in monitoring for intruders and may have devices to alert allies such as alarms. They may be accompanied by dogs, or some fantastic counterpart, which assist them in sniffing out enemies and attacking them. Alternatively they may use Surveillance Drones for the same purposes. Stat-wise, they may be frailer than regular Mooks so they can be easily dispatched if done properly. Typically these sorts of Mooks are classified as "security guards" or just "guards". See also Enemy Summoner and The Guards Must Be Crazy. Compare Roaming Enemy.
- Superman II: Non kills a guard with a Neck Snap, but not before the guard activates a device on his belt and raises the alarm.
- Dungeons & Dragons. A number of adventures have included guards who can summon reinforcements.
- T1 The Village of Hommlet. When one group of guards is encountered, they make a low hooting sound that brings more guards. If they're being defeated they start howling, which summons all of the remaining opponents.
- T1-4 The Temple of Elemental Evil. A group of hobgoblins will strike a gong to alert other nearby guards and bring them to attack.
- Dragon magazine #132 article "With All the Trappings": a guard in the Grey Griffon Inn can pound on a gong with a mallet and arouse the entire inn.
- Castle Wolfenstein: if one of the guards sees you while you aren't wearing a uniform (and for SS guards, even if you are), he will call out to alert other guards and possibly activate an alarm.
- The purpose of the regular soldiers in Metal Gear Solid 2. When they see you, they'll call for back-up and more heavily armored and better organized soldiers will arrive to assist; these guys are the real killers. These regular soldiers are little threat on their own (except on higher difficulties) and the real threat they pose is calling in these kill-squads.
- Batman: Arkham Asylum and Batman: Arkham City: later in the game, Mooks will have devices on them that alert each other if they are knocked out, causing the rest to be more cautious and more scared.
- Most Pre Existing Encounters in Final Fantasy XIII who aren't nailed to a particular spot are this. They are usually easier than stationary enemies because you can get a preemptive attack on them while their back is turned.
- Bioshock Infinite: the Boys of Silence act like this; if they detect you they will call in other opponents to attack you.
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