'How I Met Your Mother' Season 9 Spoilers: Ted Returns "The Locket" in Premiere Episode 1 / Marshall and Lily in Rome? [TRAILER]

We're all counting down the days until How I Met Your Mother premieres its ninth and final season September 23 on CBS. Throughout the shows long run, there have been a lot of side stories, many of which haven't been fully resolved yet.

With so many questions yet to be answered, how will How I Met Your Mother incorporate them all into Season 9?

By the end of last season Marshall, Lily and their baby were set to move to Rome for a year. With all of Season 9 set during the weekend of Barney and Robin's wedding, could some episodes flash back to the Eriksen family year in Rome?

Two words: slap bet. Finally Barney gets his wedding day slap.

How I Met Your Mother creators Craig Thomas and Carter Bays have already confirmed Robin's pop-star past will provide a few laughs in Season 9.

In the Season 9 premiere Ted returns "The Locket" to Robin. Are the two friends finished romantically for good?

Robin's Canadian mother, who has never been revealed, will make a few appearances in Season 9. If she looks like her daughter then sign me up...yowza!

Somewhere in the 24-episode long Season 9, we'll finally see Ted and the "mother" on their first date. How will this date be different from all of Ted's failed relationships?

Also in Season 9, fans will get to know a little bit about the mother's past. Cristin Milioti, who is a regular on the final season, will take us through the mother's dating history, friends and much more!

Tune in for the How I Met Your Mother Season 9 premiere September 23 on CBS.

Check out this Season 9 trailer: