arrow karl yune maseo yamashiro season 3 gi 'Arrow' Season 3: Karl Yune to play Maseo Yamashiro, Katana's husband

“Arrow” Season 3 has another martial arts expert coming to the flashback world of Oliver Queen: Karl Yune will play Maseo Yamashiro in several episodes when the show returns in the fall.

According to TVLine, Maseo is one of Oliver’s handlers when he is taken to Hong Kong by A.R.G.U.S. Both a teacher and a friend to Oliver (Stephen Amell), Maseo is also the husband of Tatsu Yamashiro — also known as Katana.

RELATED: Devon Aoki cast as Katana.

The full relationship between Oliver and the Yamashiros will only become clear when “Arrow” Season 3 premieres Wednesday, Oct. 8 at 8 p.m. ET/PT on The CW.