Odo: Star Trek timeline

2337: Odo is discovered adrift in the Bajoran System

2356: Taken to Bajoran Institute for Science for study

Before 2365: Arrives on Terok Nor

2365: Charged by Gul Dukat to investigate a murder. He discovers Kira Nerys was the killer five years later.

2366: Security Chief aboard Terok Nor

2366: Assassination attempt on Gul Dukat; Odo allows several people to be executed after a hasty trial; he discovered his sloppiness allowed innocent people to die.

2369: Terok Nor becomes Deep Space Nine with Cardassian withdrawal and Federation entry. Odo remains security chief.

2370: Helps break the terrorist group The Circle

2371: Discovers his people; they are the Founders

2371: Odo became the only changeling to kill another

2372: Transported back to 1947 Roswell, New Mexico

2372: Coup on Earth thwarted by Ben Sisko

2372: Becomes extremely ill; Odo joins the link and infects them. They punish him for killing the other changeling by making Odo a solid.

2373: Quark discovers an infant changeling. The being died, but helped restore Odo’s powers.

2373-5: Dominion War

2375: Convinced the female changeling to surrender and end the Dominion War.

2375: Returns to the Great Link

2376: The Great Link dissolved leaving Odo to run the Dominion

2384: He learned of a Typhon Pact attack on DS9 and returned to warn the station. The wormhole collapsed trapping Odo in the Alpha Quadrant.