For every Ying there must be a Yang.

When a series of bad happenings appears in Equestria, Clockwork is sent to fix it; but as he and his parter, Lucktwist, begin to discover, Equestria is beyond saving.

Clockwork meets Derpy's past self and makes quite the impression on the young Ditzy.

Whilst traveling through all of time and space, Clockwork manages to choose out a particular melody from the chaos of life. This leads him and Octavia through a wonderful and bright future, but will it be able to last?

Turns out Clockwork is the reason for Doctor Whooves' coming to Equestria. The two fight together to get to the center of the changeling-infested Canterlot to stop the invasion.