Star Trek: 10 Things We Now Know About Agent Daniels (aka Kovich)
9. Tepid Temporalities To Total Time Wars
When it came to the Temporal Cold War, the creators of Star Trek: Enterprise weren't exactly warmed to the idea in the first place. As Brannon Braga described it in The Fifty-Year Mission: The Next 25 Years, the Temporal Cold War element was only added to Enterprise because "[the studio] demanded that there be some futuristic thing in it". By logical extension, that means Daniels only existed by that studio request, too.
But exist they did, and Daniels and fellow temporal agents were front and centre of the fight to maintain the Temporal Accord. That latter phrase was, moreover, always used in the singular by Daniels in Enterprise until his plural "Temporal Accords" in the fourth season episode Storm Front, Part I. The Accord(s) was not originally a blanket ban on time travel tech either, but rather an agreement for its regulation and proper use ("for research").
When we first met Daniels, he was after Silik, a Suliban working for the Cabal, one of those factions that didn't particularly like the terms & conditions of the time travel pact, interfering in historical events for their own benefit. What started as cold moved quickly to tepid, then rapidly to let's-drop-the-adjective-and-just-go-all-out war(s)!
No sooner had Captain Archer and crew stopped the Sphere Builders, than they found themselves in the paradoxical position of having to end the Temporal Wars (plural) before they'd technically even begun. One last 'mission' on behalf of Daniels, now dead, meant stopping Vosk and the rest of the Na'kuhl in 1944. When the timeline reset itself at the end of Storm Front, Part II, that was the last we saw of Daniels, reborn, for nearly 20 and a thousand years.