Question: I was rewatching Stargate-SG1 and noticed something while I was watching "[Menace](http://stargate.wikia.com/wiki/Menace)" where we learn that the android Reese created the Replicators and sent them out in to the galaxy.

We know that the Replicators integrate technology they consume to their own and lastly we know of no race that were capable of travelling between galaxies (and that lives in the Milky Way) aside from the ancients

My question is, how did they end up in the [Asgard galaxy](http://stargate.wikia.com/wiki/Ida) (Ida) and why didn't they consume everything in the Milky Way long before the series began?

Is is ever explained?

![enter image description here](https://i.stack.imgur.com/jJP0K.jpg)

Answer: 
The short answer is that it's not explained in canon. Although the Asgard have had a presence in the Milky Way Galaxy for a very long time (and hence it would be logical to assume they encountered the Replicators there) Thor [explictly states](http://stargate-sg1-solutions.com/wiki/3.22_%22Nemesis_Part_1%22_Transcript#Transcript) that they were first encountered in the Ida Galaxy.

> 
> **THOR :** ***They were discovered on an isolated planet in our home galaxy*** some years ago. The creators were not present.
> 
> 
> **TEAL'C :** *Most likely destroyed by their own creation.*
> 
> 
> **THOR :** *The Replicators were brought aboard an Asgard ship for study before the danger could be fully comprehended.*
> 
> 
> **O'NEILL :** *We do that all the time. I kinda expected more from you guys.*
> 
> 
> **THOR :** *Overconfidence in our technologies has been our undoing. The entities learned from the very means that were employed to stop
>  them. They have become a plague on our galaxy that is annihilating
>  everything in its path.*
> 
> 
>
The answers are not in any single episode or any single show. You really have to watch Stargate-SG1 and Stargate-SGA (Atlantis) in their entirety to come to the conclusion.

The Ida Galaxy is the Asgard designation for the Pegasus Galaxy which is the Terran designation for the next closest galaxy in our local cluster.

The Events of SG1 took place primarily in the Milky-way Galaxy until the events of the Ori took them to another galaxy that has never been pin pointed.

The replicators were creations of the Ancients (Au-Terran's) which as we all know was the first human species to evolve in any Galaxy that we know of to date, not counting the races in the Great Alliance and others seeded by the Ancients.

Thus we can determine that the Replicators never left the home galaxy, in fact After the Ancients created the replicators they sent them forth to attack the Wraith, after years of war the Wraith found the shut down code for the replicators, this is not before the events of the Ancients realization that the replicators would never be the weapon they intended and attempted to destroy them. In fact they closely destroyed their world but a few cells survived and continued the primary directive.

The true question is how the replicators (Reese) got from the Pegasus/Ida Galaxy got to the Milkyway. More then likely the replicators stowed away on either a Asgard ship or an Ancients ship, as both races being in the so called "Great Alliance" had inter-galactic hyper-drives landed on the closest planet and continued.