ABC has renewed Castle for a Season 7, which will delight fans who have followed the main characters over the past 6 seasons, and also who want to follow up on what happens after the dramatic Season 6 finale episode.

A number of spoilers have arrived for the Season 6 Final Episode, which sees Beckett and Castle preparing for their much awaited wedding, but their plans will not go smoothly.

According to reports, there is a certain guy in the past who will try to ruin everything. Will Caskett fans able to see a successful completion of For Better or For Worse?

The Caskett love story is one of the longest love stories on TV. Fans have seen Beckett and Castle struggle for love as they avoid, denied, and fought with it, until finally they succumbed.

In Castle Season 7 Episode 23, the leading lady will be walking down the aisle. But happiness will not come as easy as that.

Beckett finds out that she needs to divorce first in order to marry Castle - and she surprisingly brings back a mystery man from the past.

According to TV Line, it could be Rogan O'Leary (Eddie McClintock), who is known for his lying and cheating reputation.

"Weddings can either go off without a hitch or they can be disastrous. [But] people can end up together after the disaster. We still have a few tricks up our sleeve," Castle creator Andrew Marlow told TV Guide.

ABC wrote a synopsis saying: "In the sixth-season finale, Castle and Beckett prepare for their wedding. However, an unwelcome surprise may ruin things, so they embark on a zany adventure, encountering masked men and mad bikers along the way."

Castle Season 6 final episode airs on Monday, May 12 10/9c on ABC.