Outsiders cannot enter our reality, without someone letting them in through the Outer Gates. Only mortal magic can call up Outsiders—it wasn't the Vampires that called them up in the battle on the Ways. 
They collaborate very effectively, making them most dangerous.
The White Council thinks that Outsiders are crazy creatures that go rampaging in any random direction. Harry disagrees saying they are "crazy like a fox."  They are good at psychic assaults and they love using them.
In the seriesEdit
- Main article: Death Masks
In Death Masks, for the test of Will at the Duel between Harry Dresden and Duke Paolo Ortega, The Archive chose to use a sphere of Mordite. It looked like a soap bubble with tentacles. It is called Deathstone because it kills anything living that it touches. It is not of our reality. It's "congealed antilife" from the Outside.
- Main article: Dead Beat
In Dead Beat, during The War, the Red Court had called up Outsiders against the White Council, who were retreating with wounded, along the Ways in Faerie. Ebenezar McCoy and Martha Liberty held the Reds off them long enough for Arthur Langtry and the Gatekeeper raised a Ward to block them while the Wardens escaped with the wounded.
- Main article: Proven Guilty
In Proven Guilty, Michael Carpenter was with the Wardens at Luccio's training camp in Colorado when he got Harry's message to come right away with Council Members. So, he happened to be with Luccio, Ebenezar McCoy, Listens-to-Wind and the Wardens when they traveled through the Ways and fought Outsiders with fangs and tentacles.
- Main article: White Night
In White Night, Lasciel told Harry that Vittorio Malvora was possessed by an Outsider and given power that enabled him the immense ability to psychically attack which he was right then, wielding in the Battle of the Deeps, crippling everyone present. Lasciel also told Harry that He Who Walks Behind is an Outsider, the most potent of Walkers, and a powerful knight among the ruling entities—and Harry overthrew him. She told Harry that he was born under circumstances that would give him the potential to wield power over Outsiders.
- Main article: Turn Coat
- Main article: Cold Days
In Cold Days, the Outsider He Who Walks Before attacks McAnally's Pub when Harry refused to give himself up. When discussing Sharkface (He Who Walks Before), Harry told Thomas what little he knew about them. Mac let Harry know there are three of them, by symbolically using three beer bottles to cover for giving Harry information. Someone is letting in Outsiders in a plot to release what was imprisoned underneath Demonreach by The Original Merlin: six Naagloshii and hundreds of dark gods.
- Main article: Cold Case
In Cold Case,
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