Anna Maxwell Martin
The Gavin & Stacey creator is starring opposite Line Of Duty star Anna Maxwell Martin in the new play The Constituent.
The actor also revealed whether she might return as the dastardly DCS Patricia Carmichael.
This might also be where you'd already seen the actors before, too.
The BBC Two sitcom is returning for its third series.
The actor also claimed DCS Patricia Carmichael was "misunderstood" and "just wants a nice cuddle".
Will this mean more trouble for Ted Hastings?
There's a new arrival in AC-12 as the series draws to a close.