I've been quite lazy regarding posting new ideas here but, Here are some new Ideas regarding possible general conceptual plotlines for various time periods.
11975 BC: Baby steps to rebuild civilization
7600 BC: Unfinished business/Saving the past/Fighting a great evil/Time Crash.
1 AD: Guiding The Beginning of a new era.
1025 AD: Retaking control/Inspiring the return of freedom.
1999 AD: The present/Saving the Future/Those chosen by fate itself to save the planet
2400 AD: The Future/Cementing the defeat of Lavos/Chronopolis.
Don't really have any ideas for 65 million BC or 600 AD as their story lines had already played out in CT.