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Various Star Trek series and movies have shape-shifting species, but do the Changelings appear in canon outside of Star Trek: Deep Space Nine? If not, has there been any reason stated for this? Major alien species often appear again in later series, but I am not aware of the Changelings appearing after Deep Space Nine.

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Changelings, yes. Founders, no. – Valorum Mar 5 at 17:55
The main reason is presumably that one of the pre-conditions of the Dominion surrender was that they'd stay in the Delta Quadrant and mend their ways. – Valorum Mar 5 at 17:56
@Richard The Dominion (and the Great Link) is in the Gamma not the Delta Quadrant... – BMWurm Mar 5 at 18:16
@BMWurm - Even more interestingly, the prop treaty (pictured below) contains the same typo. The Dominion is referred to as being in the Delta quadrant, not the Gamma – Valorum Mar 5 at 18:59
How would we know if they had? – Michael Mar 5 at 20:35
up vote 10 down vote accepted

At the end of DS9, the Founders sign an instrument of surrender known as the 'Treaty of Bajor'. A closer view of the prop shows that one of the key stipulations is that all Founders (and their vassals) must leave the Alpha Quadrant immediately and remain in the Gamma Quadrant.

This would obviously explain the conspicuous absence of any Founders in future episodes of Voyager or the subsequent theatrical films.

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All military forces of the Dominion, including Founder, Jem’Hadar, Vorta, or other allies are to withdraw from the Alpha Quadrant effective 26 hours following the general ceasefire order. No Dominion military personnel, spacecraft, or materiel are to remain in the Alpha Quadrant without the express written consent of the joint Alpha Quadrant powers.

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And no one had discovered the wormhole yet during Enterprise, so that explains their absence in that series. – amaranth Mar 5 at 19:26
It says "all military forces", which doesn't preclude Founders per se to travel to the Alpha Quadrant though... – mb21 Mar 5 at 20:06
@mb21 - As the military leaders of the Dominion, I think you'd have a hard time arguing that any Founder could be described as non-military. My guess is that, erring on the side of caution, you'd simply bar their entire race access to the wormhole unless invited. – Valorum Mar 5 at 20:09

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