The Best Episodes Written By Oanh Ly

The BAU team races to help Hotchner find The Reaper and save his family before it's too late.

When a new type of chemical warfare is released into the open air, the BAU must act quickly to find the source before any more innocent people are exposed.

As polar night looms, Gus and his crew arrive at the outpost — but they're not alone. To find Birdie and the cave, they must brave several obstacles.

The team is called to Montana to investigate the case of four kidnapped and murdered women. When another woman disappears, the search leads to a man who apparently has assumed the identity of his dead partner.

The BAU team tracks a serial killer who keeps the eyes of his victims as souvenirs.

The team pursues a copycat serial killer who is recreating the techniques used by past famous murderers.

The coven prepares for an annual ritual as Harvey takes part in a Kinkle family tradition. Sabrina grows suspicious of Lady Blackwood.

The Man informs the Messengers one of their own has betrayed them and another is in imminent danger, while Amy's drawings predict the arrival of someone who could change the course of everyone's destinies.

The BAU investigates a series of murders that appear to be connected to a killer who jumps trains and chooses his victims based on their proximity to the railway.

The BAU travels to Houston to investigate a series of murders that have occurred near construction sites and abandoned buildings. Because the murders appear to be random, the team believes the killer could be a homeless person. Meanwhile, everyone is noticing an apparent change in Reid's behavior.

Love and lust sweep through Greendale as Harvey surprises Roz with a sweet gift, and Sabrina explores a romantic ritual ... and her feelings for Nick.

After an eventful, obstacle-strewn journey to find a safe haven, Gus learns more about his origins and how far Birdie was willing to go to protect him.

The BAU follows the mental decline of a con artist whose schemes have become so complicated that he begins to eliminate the people involved in them.

Gus' expedition with Dr. Singh leads to several shocking discoveries. Big Man and Aimee seek refuge and reinforcements. Becky connects with a new friend.

On the hunt for the Horseman of War, Joshua, Erin and Peter make great strides for the group. Raul and Vera are more hesitant to believe and when they stray, there are unforeseen consequences. But when Vera discovers her gift, she finally starts to rethink her purpose.

Anderson Vaughan Investigations takes on a case that hits close to home when Valerie’s estranged husband, Gordon, comes to them for help after his sister suffers horrible side effects in a Multiple Sclerosis clinical trial by a big pharmaceutical company. Meanwhile, Alice is following her biggest lead yet in tracking down Ben, as he’s in the midst of luring their next victim, Princess Zara Al-Salim, into a multimillion dollar fraudulent real estate investment.

A captive Nora is tortured and left for dead. Monroe learns of Rachael’s attempt to reach the Tower but is unaware of her deadly plan for him. Meanwhile, Miles is desperate to find out how so many of his close associates are being brutally murdered. Later, Miles, Charlie, Neville, Jason, Hudson and Sanborn struggle to make it out of the Plains Nation to join Rachel and save her from what they believe to be certain death.

As Sabrina longs for a piece of her past, vengeful visitors return to Greendale. The Fright Club competes in a life-or-death battle of the bands.