Halo and Avatar: Last Airbender Crossovers
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The Last Battle Front by PurpleSingingDragon
Troy (Boy) and Chase (Girl) are sibling's living in Blue River Wis. While Chase was out one day reminiscing, she noticed the sky go gray. This was unusual for it was the middle of the day, broad daylight. Then she noticed a very similar symbol, one she'd seen from a video game, one that would change her life completely.
Rated: K+ - English - Adventure/Fantasy - Chapters: 1 - Words: 767 - Published: 7/14
Avatar: The Adventures of Rookie by The Italian reviews
ODST John Oltz a.k.a 'Rookie' was being dropped into his next mission. But when things take a turn for the worse, he finds himself on a new world. With no contact with the UNSC he is forced to help his new friends in a deadly revolution
Rated: T - English - Mystery/Adventure - Chapters: 4 - Words: 11,699 - Reviews: 14 - Favs: 32 - Follows: 40 - Updated: 12/21/2014 - Published: 6/2/2014 - [Aang, Katara] OC
Avatar: rise of anti-benders by invincible824 reviews
After a hundred years of war, the avatar Aang thinks he can live a normal life, but the ONI take this peace to create another war where it will test all benders.
Rated: T - English - Sci-Fi/Fantasy - Chapters: 7 - Words: 10,648 - Reviews: 16 - Favs: 4 - Follows: 4 - Updated: 7/6/2014 - Published: 4/30/2013 - Serin O./Serin-017, Aang
Visitor by WARLOCK2552 reviews
Someone from the stars has come to their world. His arrival may have unforseen consequiences. Cross over with HALO.
Rated: T - English - Sci-Fi/Fantasy - Chapters: 7 - Words: 47,567 - Reviews: 101 - Favs: 133 - Follows: 147 - Updated: 6/18/2013 - Published: 7/3/2012 - Master Chief/John-117
The Last Tale of John-117 by Kamil the Awesome reviews
Year 2560. The UNSC, watching over the Avatar's world, sends a guardian to make sure the Fire Lord is defeated. However, events are now set in motion that will change everything.
Rated: T - English - Adventure - Chapters: 6 - Words: 14,194 - Reviews: 18 - Favs: 20 - Follows: 19 - Updated: 12/29/2012 - Published: 11/16/2012 - Master Chief/John-117
Kungfubar by ZecoreZecron reviews
With little supplies left and only half of a ship, the remaining crew of the Dawn sets down on what they think is an uninhabited planet. Instead they find a world at war with itself. Slight AU.
Rated: T - English - Sci-Fi/Adventure - Chapters: 5 - Words: 9,794 - Reviews: 29 - Favs: 33 - Follows: 48 - Updated: 8/13/2012 - Published: 3/14/2012 - A. J. Johnson, Sokka
The Misadventures of Dorflap the Grunt by AzureSpider reviews
Just something rather random I came up with. The untold tale of a Grunt who escaped Halo's destruction and ended up on a strange new world...
Rated: K - English - Sci-Fi/Humor - Chapters: 2 - Words: 2,622 - Reviews: 19 - Favs: 9 - Follows: 11 - Updated: 5/2/2011 - Published: 4/17/2011 - OC, Ty Lee
Reclaimer: The Last SPARTAN by Classic Cowboy reviews
Book 3 Avatar postHalo 3. As the summer draws closer, the Fire Nation enlists the aid of a never before seen demonic force that even the Avatar is no match for, but in their darkest hour, help comes from the stars.
Rated: T - English - Adventure/Sci-Fi - Chapters: 5 - Words: 13,129 - Reviews: 217 - Favs: 141 - Follows: 180 - Updated: 4/13/2008 - Published: 10/2/2007 - Master Chief/John-117, Aang