... in 1975, the Host was born. Angels sang, rivers ran with wine, and Darwinian evolution came to a halt as it's pinnacle had been reached! Or something. Little did he know IDV would be dropping in 30 years down the line.
... in 2007, IDV stares into his crystal ball to see what kind of cake The Mother has made him. Instead, he sees this timeline. Bugger.
... in 2011, IDV's secret* errand for Tim, to obtain a sample of The Shat's DNA for nefarious cloning purposes, goes hideously wrong. He is catapulted into the future, to 2230, where one of Winona Kirk's eggs is accidently fertilised with the appropriated DNA.
... in 2231, Captain** James Tiberius Kirk is born. The rest will be history.
Or will it?
* Oops! Sorry Tim. Not so secret now...
** Obviously, he's not born as a captain. For a start, his rank insignia would have torn something on the way out. Look how pointy it is: