History UniqueEnemy / Halo

* In "The Ark", the Grunt Heavy manning the Phantom's door gun in the Scarab arena carries a Brute Spiker instead of the usual Plasma Pistol.

** During the Mongoose run in "The Pillar of Autumn", a pair of Scarabs drop down to intercept the player. This is their only gameplay appearance in ''Reach''. Functionally, they are essentially the ''Halo 3'' Scarabs without the ability to damage and destroy them.

** Also in the final level, there is a single Flood Combat Form in the last hallway before the engine room that is [[TheMissingno allied with the Covenant]].

** "Quarantine Zone" has a single Sentinel that shoots with Needler rounds instead of the Sentinel Beam. According to one of the programmers, it was a rejected concept they [[TheMissingno forgot to remove]].

** "Gravemind" had the "Honor Guard Councilor", a one-off enemy type who appears at the end of the Mausoleum battle. It is actually a [[TheMissingno glitched]] Zealot Elite,[[note]]This specific Elite is tagged to have a voice actor that is not scripted to load in for this level. Unsure of what to do, the game gives it the default armor color (silver), a random head (including the Councilor helmet, hence the name, but it is also possible to see regular helmets, or even Rtas 'Vadum's disfigured face), and the Honor Guard's ornaments (which are part of every Elite's model, but is usually hidden unless the Elite is an Honor Guard).[[/note]] and this is the only Zealot fought on difficulties lower than Legendary.

** In the Spartan Ops "Switchback" mission, there is a Promethean Crawler that uses a Lightrifle. This particular Crawler is referred to as the "Lightrifle Crawler" on Halopedia and Halo Nation and is most likely an occurrence of TheMissingno.

** "Gravemind" had the "Honor Guard Councilor", which was actually a [[TheMissingno glitched]] Zealot Elite.[[note]]This specific Elite is tagged to have a voice actor that is not scripted to load in for this level. Unsure of what to do, the game gives it the default armor color (silver), a random head (including the Councilor helmet, hence the name, but it is also possible to see regular helmets, or even Rtas 'Vadum's disfigured face), and the Honor Guard's ornaments (which are part of every Elite's model, but is usually hidden unless the Elite is an Honor Guard).[[/note]] This is the only Zealot fought on difficulties lower than Legendary. This is also the only level where Spec-Ops Grunts and Elites appear as enemies. Likewise, an Elite during the final battle can be seen using a Fuel Rod Gun.

* ''VideoGame/Halo3ODST'' has an NMPD officer who will turn on the Rookie because HeKnowsTooMuch on "Data Hive"[[note]]But only if you've already collected 29 audio logs, then followed the cop after the part where he tells you not to[[/note]]. This is the only time in the entire series that you have to fight a human enemy. "Data Hive" is also the only time in the campaign where there are gold-colored Drones, who are apparently adolescent leaders. Only one gold Drone appears, however.

** "Gravemind" had the "Honor Guard Councilor", which was actually a [[TheMissingno glitched]] Zealot Elite. This is the only Zealot fought on difficulties lower than Legendary. This is also the only level where Spec-Ops Grunts and Elites appear as enemies. Likewise, an Elite during the final battle can be seen using a Fuel Rod Gun.
** "Quarantine Zone" has a single Sentinel that shoots with Needler rounds instead of the Sentinel Beam. According to one of the programmers, it was a rejected concept they [[TheMissingno forgot to remove]].

** At the end of the underwater passage on "Regret", you encounter a group of stealth-cloaked Grunts, which are never seen again (as enemies).

** In "High Charity", in the Prophet's inner sanctum, some cloaked Flood will spawn on higher difficulties. In addition, a single Flood Combat Form carries a Brute Shot, while a few others carry Brute Plasma Rifles.

** The Elite Field Marshal is the only one of its rank in "Pillar of Autumn". It is basically a high-ranking Zealot that rapidly fires a Fuel Rod Gun and throws grenades at the player. When its shields are down and when the player is close, it unsheaths its Energy Sword in an attempt to One-Hit Kill the player.
** There's one point early in the game where you fight a pair of King Kong-sized lizard-gorillas (referred to as [[https://www.halopedia.org/Gúta Gúta]]), who are basically part of Reach's local wildlife. They're tougher than Covenant, but not so tough that you could call them a boss battle or anything. They're never seen or heard of again afterward, making the whole encounter something of a BigLippedAlligatorMoment.

** "Long Night of Solace" is the only level that features Space Banshees, Phantom Gunboats, and Seraphs. This is in fact the only mission in the series where you encounter them (a side effect of being one of the only missions actually set in space).

** In the final level you can encounter the only group of cloaked Flood Combat Forms in the game. They only appear if you wait around for too long inside the armory.
** Also in the final level, there is a single Flood combat form in the last hallway before the engine room that is [[TheMissingno allied with the Covenant]].

** In only one room in the final level do you encounter cloaked Flood.

** "Long Night of Solace" is the only level that features Space Banshees, Phantom Gunboats, and Seraphs. This is in fact the only mission in the series where you encounter them (a side effect of being the only mission actually set in space).

** There's one point early in the game where you fight a pair of King Kong-sized lizard-gorillas (referred to as [[http://halo.wikia.com/wiki/G%C3%BAta Guta]]), who are basically part of Reach's local wildlife. They're tougher than Covenant, but not so tough that you could call them a boss battle or anything. They're never seen or heard of again afterward, making the whole encounter something of a BigLippedAlligatorMoment.

* In ''VideoGame/HaloWars'', the eighth mission ''Anders' Signal'' has Brutes (as well as Choppers), the only time in the campaign where they appear as enemy units. These are both fought ''plenty'' of times in other games, but only here in this one. They are fought at the beginning, and their introduction is completely overlapped by the subsequent introduction of the Flood.

** "Long Night of Solace" is the only level that features Space Banshees, Phantom Gunboats, and Seraphs.
* In ''VideoGame/HaloWars'', the eighth mission ''Anders' Signal'' has Brutes (as well as Choppers), the only time in the campaign where they appear as enemy units. They are fought at the beginning, and their introduction is completely overlapped by the subsequent introduction of the Flood.

** There's one point early in the game where you fight a pair of King Kong-sized lizard-gorillas (referred to as [[http://halo.wikia.com/wiki/G%C3%BAta Guta]]), who are basically part of Reach's local wildlife. They're tougher than Covenant, but not so tough that you could call them a boss battle or anything. They're never seen or heard of again afterwards, making the whole encounter something of a BigLippedAlligatorMoment.

** Similar to the [=BOBs=], the first level contains a lone Stealth Elite (different color than the cloaked Spec-Ops Elites encountered later) nicknamed "Bill", which can be spotted just before the moas first appear. If killed, it drops a data pad that can be read. This also may be a leftover from a dummied-out objective.

* In ''VideoGame/HaloWars'', the eighth mission ''Anders' Signal'' has Brutes (as well as Choppers), the only time in the campaign where they appear as enemy units. They are fought at the beginning, and their introduction is completely overlapped by the subsequent introduction of the Flood.

** "Long Night of Solace" is the only level that features Space Banshees, Phantom Gunboats, and Seraphs.