He’s a Welshman with nothing to lose. What could be more dangerous than that?

Judging by the trailer for creator Kurt Sutter’s period drama “The Bastard Executioner,” fans should assume that the answer is not much else.

The teaser, which was unveiled over the weekend at Comic-Con and also aired on FX during the season two premiere of “The Strain,” shows the eponymous sword wielder (played by newcomer Lee Jones) marching through rows of bodies and not seeming particularly happy about what he sees. What’s his plan to right these injustices? He has none, besides vengeance.

“The Bastard Executioner” received a 10-episode series order in May. It premieres this fall on FX. Sutter wrote the pilot, which is directed by fellow “Sons of Anarchy” alum Paris Barclay. They are exec producing along with Brian Grazer and Francie Calfo. In addition to Jones, the series also stars Katey Sagal, Stephen Moyer, Flora Spencer-Longhurst and Sam Spruell. Darren Evans, Danny Sapani, Timothy V. Murphy, Sarah White, Sarah Sweeney, Elen Rhys, Ethan Griffiths and Matthew Rhys also appear.