What's New Tonight: Wednesday, May 15th.

8:00 PM EST:

“Arrow” on The CW. Season 1 Finale. Oliver and Diggle try to stop the Dark Archer. Thea tries to find Roy but puts herself in danger in the process. On the island, Slade, Oliver, and Shado get caught in a life-or-death struggle with Fyers, who has missiles heading for a Ferris jet.

“American Idol” on FOX. Part 1 of the 2-part Season 12 Finale. Candice Glover and Kree Harrison battle it out for the title of the next American Idol. Featuring a performance by Carly Rae Jepsen.

9:00 PM EST:

“Criminal Minds” on CBS. The unit tracks down a suspect in Detroit who is targeting innocent people. Blake’s husband returns home from overseas with a new, life-changing career proposition for her.

“Law & Order: Special Victims Unit” on NBC. The team tries to identify an unconscious woman, and find that she’s an ordinary mom with a secret wild side.

“Supernatural” on The CW. Season 8 Finale. Crowley is working to undo all the good that Sam and Dean have done as hunters, but the Winchester Brothers have one final play up their sleeves to help fight the King of Hell. Metatron convinces Castiel to help him take down Naomi and the corruption in heaven.

10:00 PM EST:

“Chicago Fire” on NBC. Casey is forced to team up with the Intelligence Unit, which is led by Voight. Shay looks forward to being a parent. Mills and Dawson deal with personal issues. The station comes together in support of Molly’s grand opening.

“CSI: Crime Scene Investigation” on CBS. Season 13 Finale. The team investigate a string of murders that are eerily similar to the sins in ‘Dante’s Inferno’.

“Psych” on USA. When their favorite DJ is murdered, Shawn and Gus go undercover at the local radio station to investigate.

“Nashville” on ABC. Lamar sides with Rayna, opposite of Teddy in regards to the girls. Jolene tries to help Juliette. Avery and Will get the chance to lift their careers. Tandy proposes her own ideas.