Looking at pictures of him as Carcetti and Littlefinger, there's something in his expression that just screams Garth for me. Maybe we could witness his fall from grace and the chain of events that ended up with him on Elba II. But no matter who he'd play if he were really cast, I agree with those before me that he would surely be a most welcome addition."Rumor: Aidan Gillen, actor well-known for the role of petyr baelish in game of Thrones, could play a key character or even the villain in the second season of Star Trek: Discovery.
According to the rumor, the actor may appear in the final episode of the first season of the series.
Source: an article published on moviepilot, and shortly after removed.
In anticipation of true confirmations, the news is to be considered only as a rumor."