Season 5 of Teen Wolf continues with its horror movie vibe, using cliffhanger endings to keep us enthralled each week. “Strange Frequencies” opens moments after the end of the previous episode, “Required Reading,” and then ends with a big question mark as well. This is a gripping approach for future binge-watchers, but torture for those of us in the present, watching weekly. Oh, who are we kidding? We love the suspense. If Teen Wolf wants to keep us in the dark, we can live with it for now. “Strange Frequencies” adds to the mystery of Season 5, leaving us with more questions than answers.