Teen Wolf - Season 5, Episode 09: Lies of Omission
Trailer
Scott and friends begin senior year, as they start to look to the future, and maybe life without each other. However outside forces are planning to break up the pack permanently. Scott faces his biggest threat yet, as new villains use both science and the supernatural in order to execute.
The penultimate episode is better than what's come before it, enough so that there's a chance this entire first half of season five won't seem like a waste...