The TV Show:
- Awesome Music: Mark Snow provides a beautiful opening score and the Soundtrack boasts the likes of Nine Inch Nails and Portishead.
- Complete Monster: Frank Black has faced many killers and other villains. These are the absolute worst.
- From season 1's "522666", Raymond Dees is a Mad Bomber who derives sexual pleasure from the numerous deaths he causes. He initially blows up a crowded bar while watching the scene from afar. He later plants bombs in an office building, killing dozens more, and then participates in the rescue of the wounded simply so he can be hailed as a hero by the community. When Frank Black eventually discovers his true identity, Dees realizes that his game is up and arranges to be killed by the Feds so he can become notorious as a criminal instead, but not before taunting Frank with the possibility that he's rigged Frank's car to explode.
- From season 1's "Maranatha", Yaponchik (aka Sergei Stepanovich, real name unknown) is a mass murderer who sees himself as an Antichrist figure whose mission it is to spread evil in the world. Taking inspiration from the Book of Revelation, he causes the Chernobyl disaster to kill many people and poison the land. A decade later in the United States, he kills a police officer and several people who tried to appease him, to re-establish his status as The Dreaded to the Russian community. He kills one of the two Russian officers who had been tracking him ever since Chernobyl by shooting him in public. He later goes on a killing spree in a bathhouse, before using religious fear to convince his nemesis Surova to help him escape so that he can continue his rampage elsewhere.
- From season 2's "The Mikado", Avatar is a serial killer who terrorized the streets of San Francisco in the 1980s, claiming nineteen victims before eluding the authorities. He eventually returns to broadcast his latest murders over the internet, kidnapping several women and presenting them on a website with a counter indicating the time until their deaths. He leads the cops to a remote trailer, planting deadly boobytraps after killing the previous occupant. When Frank Black finds Avatar's new lair, he tries to kill Black as well before disguising his latest victim as himself in the hopes that Black will shoot her by mistake. Avatar never speaks, but his huge body count and his sadistic games make him one of the show's most heinous villains.
- Broken Base: Many fans were understandably upset that the Fully Absorbed Finale featured Frank having a very small role while Mulder and Scully solved all his problems for him. Others say that seeing him get a happy ending is such a relief that they could overlook it.
- The Chris Carter Effect: Also by Chris Carter, Millennium is a good example of this. The show got increasingly bizarre and difficult to follow as it went on, and the end of the third season (the last one filmed, and for good reason) provided no closure at all. Each season had a different show runner(s), each with a very different idea of what the show should be (Are Frank Black's flashes simply a visualization of his deductive skills or psychic visions? What is the Millennium group's agenda?) and no one from above willing to set boundaries. After the cancellation, the whole thing was put into the laps of The X-Files team. This resulted in a Fully Absorbed Finale for Millennium within The X-Files-verse that also failed to resolve anything.
- Harsher in Hindsight: In episode 6, Frank and Catherine's young daughter Jordan starts asking about death. Catherine tells her that they will be with her forever. Catherine dies less than two years later.
The DC Comics series:
- Fridge Logic: Revealing all of your sleeper agents at the same time may not have been the best of ideas.
- Also, you'd think those agents would have done something more than just wait until being told to attack (and get their asses beaten.)
- Marvel's Secret Invasion used this same idea decades later... to the same results.
- Exactly, how did the Guardians determine who got to be a Chosen One? There seemed to be no distinguishing quality; one of them in fact turned out to be a racist bigot and was rejected. Another (Terra of the Teen Titans) was already dead, too. You'd think the Guardians would have known that.
- What an Idiot: Harbinger, a character left over from Crisis on Infinite Earths, records the history of the universe in a device... which she leaves adrift in space for anyone to find! It was thanks to this that the Manhunters found out the secret identities of all the heroes.
- Made worse by the fact that she barely gets reprimanded for it, and in fact joins the New Guardians.