1.
Empty Planet (S2, E8). This is the most memorable "Criminal MInds" episode, and the one I have watched the most often. The team travels to Seattle to pursue a serial bomber who has stated that Seattle is "where it all began". Reid wonders what the "it" is, and Morgan says that all he can think of is "grunge music and overpriced coffee". When Gideon talks by phone with the bomber and asks what to call hinm, the guy says "Allegro". Reid hears the name and he recalls that Allegro was the name of the adopted son in a book, "Empty Planet", that he had read as a child. On the way to interview the author, who happens to be a professor right there in Seattle, Reid asks if they can stop by a bookstore to buy a copy of the book because he wants to reread it, saying "It'll only take ten minutes." When Gideon asks, "To buy it or to read it", Reid responds "Both, actually".
By this time the team has the bomber's manifesto, a la the Unabomber, and the team asks the prof if she can identify which of her students it might remind her of. As the team is leaving, Reid asks, "Mind if I ask you a question?" She consents, and he asks, "Why didn't you ever write another book?" She responds that she guessed that she had nothing more to say.
Another memorable moment occurs when the team identifies a professor who is next on the bomber's hit list. They call him in and offer to provide security for him, and he responds, "Do I look like the kind of guy who wants to be followed around by a government goon squad?"
The bomber comes to see the prof who wrote "Emopty Planet", and we discover that he is convinced that she is his birth mother. He takes her hostage, and the team rescues her. On the way back to D.C., Morgan tells Gideon, "I heard you were worried about me back there...'A young man who I grestly respect and admire'", referring to what he had said to the prof earlier in Reid's presence. Gideon then utters the greatest episode-ending line, "And what he said I said, I said."
2. Jones (S2, E18). This is the second-most memorable episode. The team goes to New Orleans to catch a serial killer who is killing men in the night club section of town. They eventually figure out, about half-way through, that the killer is a woman. They search for past rape cases, and Garcia discovers the police reports of an incident nine years earlier in which a young woman was assaulted, but the PD refused to pursue criminal charges.
It turns out that the police chief is the son of the man who had worked the case, along with his partner. The dad had died in the recent Katrina storm, but the partner is still alive. When they visit the partner, he is quite hostile and explains that he was convinced that she was "asking for it" and that in his opinion no rape had occurred. They obtain the name of the victim by interviewing the assailant, Prentiss uttering the memorable line "Does she make an impression now?" They discover her current location at a motel, through her credit card records, and they interrupt her latest assault.
Two side stories are seen thoughout the episode. Reid makes contact with a friend who dropped out of the FBI Academy on their first day, and is now a piano player in a New Orleans bar. The encounter comes at a time when Reid is struggling, but at the end he tells Gideon, "I'll never miss another plane". The other side story is the connection made between J.J. and the police chief, William LaMontagne Jr.; in later episodes they re-connect and eventually get married.
3. Pleasure Is My Business (S4, E16). The BAU team goes to Dallas to investigate the murder of corporate executives. It turns out that a high-priced call girl is doing the killings. We sympathize with her because she is damaged by resentment against her father. She endearingly sees Hotchner as a man she can trust, a sort of substitute father. At one point she asks Hotchner, "How could your wife have ever left someone like you? You're the first man I ever met who didn't let me down. Will you stay with me?"
The opening voiceover narration has Hotchner saying, "The prostitute is not, as feminists claim, the victim of men, but rather their conqueror. An outlaw who controls the sexual channels between nature and culture. --Camille Paglia."
4. Lessons Learned (S2, E10). The BAU team gets word that a terrorist attack is being planned to take place in the next 36 hours, involving anthrax. Gideon, Reid, and Prentiss fly down to Guantanamo Bay to interrogate the man believed to be the mastermind of the attack. Gideon interviews the man while Reid and Prentiss study his mannerisms. Gideon treats the man with respect, in stark contrast to the brutal torture the people running Guantanamo have been subjecting him to. Gideon tricks the man as to the time of day it is, resulting in finding out enough to foil the attack, which was due to take place at the Grand Opening of a shopping mall. On the way back from Guantanamo, Gideon beats Reid in a chess game and Reid decides to take a nap. Gideon then aske Prentiss, "Do you play, Prentiss?" She says, "Yes sir, I play." This exchange illustrates that Gideon has now accepted Prentiss into the group, after his initial skepticism at the start of the episode.
5. The Tribe (S1, E16). The team goes to Terra Mesa, New Mexico, to investigate the brutal murder of five 19-year-old students in a vacant house. The killers have staged it to look like it was the work of Apaches, but, with the help of a local tribal policeman, the team figures out that the killers were not Apache.
The appeal of this episdoe is that it spotlights the difference between the Anglo and Native Americn cultures. The tribal policeman, John Blackwolf, explains why he doesn't carry a gun: "Inside twenty-one feet, I win. Outside twenty-one, I have other options besides shooting a man."
When Blackfoot tells Hotchner, "There are many paths to the same place", Hotch tells him that he "sounds like a fortune cookie". However, at the end of the episode Hotch repeats Blackfoot's aphorism, showing that he has learned from their time together.
6. Somebody's Watching (S1, E18). In Los Angeles for a seminar, the team gets invloled with solving a series of murders. All the murders involve associates of beautiful actress Lila Archer, wonderfully (and winsomely) played by Amber Heard. Reid gets assigned as her bodyguard while the others investigate, and he develops feelings for her that he has trouble dealing with.
7. The Longest Night (S6, E1). The bad guy here is a crazed man who calls himself The Prince of Darkness, memorably played by Tim Curry. He kidnaps a yung girl, and the team works to free her from his clutches. The evil of the Prince of Darkness is illustrated by his quote, "The question isn't why do I kill people, the question is... why I don't kill everybody. I decide who dies... but mostly I decide who lives. I'm like... God." The girl is an awesome character, full of spunk, and she matches her captor's repartee all the way through.
The ending, in which Morgan and the girl reunite in a touching scene, set to Leonard Cohen's "Who by Fire", brings tears to my eyes every time. Other Cohen songs appearing easrlier in the episode are "Night Comes On", "The Sisters of Mercy", and "Dance Me to the End of Love".
8. Entropy (S11, E11). The whole episiode has Reid and the "bad guy", played by the awesome Audrey Plaza, talking in a restuarant. Sounds boring, but it is anything but.
9. Conflicted (S4 E20). College kids at South Padre Island for Spring Break are getting murdered. The team profiles that there are two unsubs working together, a submissive female who lures the victims, and a dominant male who does the raping and killing. It turns out that the two unsubs belong to the same person, a guy with a split peronality. Reid bonds with the guy in an attempt to understand him/her.
10. Riding the Lightning (S1, E14). A very poignant episode. The team is looking into the case of a woman shortly before her scheduled execution. At the end they locate the son she was convicted of murdering, but they allow the execution to go forward, honoring the mother's wish to give up her life for the sake of her son's happiness.