Criminal Minds series finale is set to air its two-part episode on CBS this coming Wednesday night. The latest trailer gives viewers a nostalgic feeling, as it shows some scenes from the series' past. The clip also teased fans what's coming for some of the characters in the present and what kind of danger lies ahead for them. Here's what we can anticipate in the epic two-hour finale.

Criminal Mind series finale will definitely give viewers a nostalgic feeling as it dives into some of the memorable moments of the series in the past. We'll have the chance to see some of the earliest days of BAU before the show concludes. The finale is going to be an emotional one, but it would be nice to see the characters having a happy ending that they deserve.

The upcoming series finale is set to bring back some familiar faces, such as a flashback version of Ben Savage's Gideon. Viewers will have the chance to see other familiar faces of members of the BAU. It has been confirmed that Josh Stewart (as Will), Gail O'Grady (Krystall), Stephen Bishop (Mendoza), and Kelly Frye (Kristy) are all coming back in the series' final run.

Everett Lynch a.k.a. "The Chameleon" (played by Michael Mosley) is also set to return in the series finale. The character is one of the most notable antagonists in the series, and he's back to torment the BAU for one last time. In the two-part finale, viewers will see the team going on an epic hint to capture Lynch. The BAU will also discover something about him, which affects Rossi (Joe Mantegna) personally.

CBS has already shared plenty of details about Criminal Minds series finale, making fans more excited. For instance, we're going to see Matthew Gray Gubler's Spencer Reid facing a life-and-death situation after suffering a severe brain injury due to an explosion. His condition will cause him to hallucinate, making him reflect on some notable and significant moments in his life.

Due to his current situation, Reid's mother Diana Reid (played by Jane Lynch) will also return in Criminal Minds series finale. It looks like she's aware of her son's condition and she recognized that something is really wrong with him. There is a huge chance Reid would survive this crisis, as they may not want to end the series with an unhappy note.

Criminal Minds series finale will deliver its two-part episode this coming Wednesday, Feb. 19, on CBS.