This review may contain spoilers

The fourth non-arc episode in a row, they keep their fingers in with a call from Frank reporting a complete lack of progress, again. That said, "Repo Man" was a nice investigation of demon possession and the aftermath with an exorcised victim ... who turns out to be less a victim and more a co-conspirator.

Jeffrey (Russell Sams) was once possessed by a demon, four years ago, that the boys needed to interrogate about Lilith. Probably to make them feel guilty, the demon foregrounds Jeffrey, who pleads for release. While he's still conscious, Dean (Jensen Ackles) obtains permission to torture his physical body to get information from the demon. When they are done and exorcise the demon, Jeffrey remains cooperative and understanding as Dean takes him to the hospital.

As it turns out, Jeffrey had had the soul of a serial killer, but not the courage to begin. With the demon, in effect, holding his hand, he was able to do what he had wanted to all along. When the demon was exorcised, he fell to drink and depression, but a good therapist (Daniel Bacon) helped him regain equilibrium and find his purpose.

Unfortunately, Jeffrey decided that his purpose was to get his demon back. He kidnapped the son (Jeffrey Ballard) of the wiccan, Nora (Nicole Oliver), who had helped the boys find the demon the first time and forced her to give him a summoning spell for the demon. "Calling" the boys by killing more women in his signature style, he plays innocent until he can get Dean alone in his lair and cast the summoning spell. He needed Dean, who exorcised the demon the first time, as a component for the second summoning.

The demon returns, possessing Nora's son. He tells Jeffrey that it was his job to help Jeffrey get started, but he's done now and will move on to other souls that need the push to be truly hellbound. That's not what Jeffrey wants to hear. At this point, Sam (Jared Padalecki) and Nora have found the lair and trap the demon. Dean kills Jeffrey, who was not taking being spurned well, and Nora's son is exorcised.

During Dean's adventures with Jeffrey, Sam has been sent on a red herring mission by Jeffrey. While alone, Lucifer (Mark Pellegrino) has been a minor to moderate annoyance, kinda pathetic for The Devil. A number of times he pleads with Sam to just talk with him. When Sam is in crisis mode, trying to find Dean, who is obviously in danger, he does speak with a surprisingly helpful Lucifer. At the end, though, Sam can no longer banish Lucifer with his hand scar abuse. Lucifer tells Sam by speaking with him, he let Lucifer "in." We fade out with visions of hellfire consuming Sam's sight.

Points Of Interest

1. This adventure takes place in Coeur d'Alene, Idaho.

2. Lilith's lieutenant -- the information that they tortured Jeffrey's demon for -- was Merrick in New Orleans.

3. Detective Sutton remembers the boys as Agents Watts and Bonham, the drummer boys, named as they were in honor of the drummers from Led Zepplin and The Rolling Stones.

4. When Lucifer sticks out his tongue, it is forked.

5. Lucifer's torments range from helping Sam remember Detective Sutton's name to giving Sam the vision that library patrons are killing themselves by bashing their brains out on the tables in front of them, but mostly he just mocks and insults.

7. After his demon adventures, Jeffrey walks with a limp and lost his job with the postal service. Eventually, he was institutionalized for talking about demons too much.

8. Nora Havelock is a wiccan, who has studied demons and now runs an online white magic supplies shop.

9. Nora had tried to call the boys, but their phone number of four years ago no longer works.

10. An extremely powerful demon summoning spell involves dog parts and the blood of the exorcist. This powerful a spell would only be needed on a demon that had been exorcised before?

11. Dean has two cell phones, one is a personal phone, and the other is for Agent Smith.

12. Nora's son has a good soul that the demon will not be able to corrupt. He intends to go to Las Vegas in search of his next target.

What Worked

Well paced and plotted, the story of what happens to this particular man after being possessed was interesting and nicely done. Dean caring for and coaching the victim that he drops off at the hospital was almost touching. The detail that Sam stayed behind to sanitize the crime scene of evidence of the boys' involvement only makes sense.

Jeffrey's catalog of injuries suffered at Dean's and Sam's hands, as well as Dean's reaction to it, was instructive.

Calm and quiet for the most part, there is very little action or violence in "Repo Man," but the character interactions, most especially Russell Sams' work, were exceptional.

What Didn't Work

Detective Sutton's strong introduction made it seem like the character was destined for a bigger role in the episode than he ended up having. Obviously, this is the smallest of quibbles. Maybe he will return in a later episode.

Lucifer's evil Greek chorus just seemed lame. Perhaps it was meant to dramatically contrast with the reveal at the end that he can no longer be banished, but it still felt like just a minor irritation for Sam.

They need to stop talking about Frank and the leviathans and do something. Perhaps if Frank has somehow been compromised by the leviathans for the past four episodes, it would explain his ineffectuality.

Once again, Dean is meting out justice that maybe could be left to human authorities. Executing Jeffrey where if left alive and arrested, he would certainly get what he deserved.

Giving Credit Where Credit Is Due

"Supernatural" stars Jensen Ackles, Jared Padalecki, Russell Sams, Mark Pellegrino, Nicole Oliver, Jeffrey Ballard, Gary Peterman, Daniel Bacon, Gwenm Carsley, Aurelio Dinunzio. "Repo Man" was written by Ben Edlund, and it was directed by Thomas J. Wright.

"Supernatural" airs Thursdays at 9 p.m. ET on The CW.