The Flash: "Family Matters, Part 2" Preview Released This week on The Flash, Barry Allen (Grant Gustin) tried to assemble the three new forces -- the Sage Force, the Still Force, and the Strength Force -- in order to protect them from a Speed Force determined to kill them. However, things didn't go quite to plan when the Speed Force got to the Still Force first and teamed up to seemingly take out not just the other forces but Iris West-Allen (Candice Patton) as well. Now, The CW has released a preview for next week's episode, "Family Matters, Part 2", and while it looks like Deon/Still Force will realize the Speed Force can't be trusted, time may be running out to stop her.