Season 4
Dexter Morgan faces his most challenging adversary yet, the infamous "Trinity Killer," Arthur Mitchell, who appears to live a double life like Dexter. As Dexter gets closer to Arthur to understand how he balances his dark impulses with a family, he uncovers dark secrets and horrifying patterns in Arthur's life. Tensions rise as Dexter's investigation puts his own family at risk, leading to a shocking season finale. My close second-favorite season is the fourth, because of the Trinity Killer. The way he executed his kills and interacted with his victims was remarkable writing. The scene where he left Rita for dead as part of his cycle was fantastic and demonstrated that even in death, he had the last laugh.
This season is my second favorite right after the first. The rest of the series felt mediocre to me.
Between the Trinity Killer, the family themes, the twists, the deaths, and the unforgettable plot, Dexter Season 4 beats all others.
Season 1
Dexter Morgan, a forensic blood spatter analyst with a hidden compulsion for killing, works for the Miami Metro Police while adhering to a moral code instilled by his adoptive father. As he investigates a new serial killer in Miami, dubbed the "Ice Truck Killer," Dexter realizes this criminal has a personal connection to his own mysterious past. The season follows Dexter as he delves into his origins, while carefully concealing his true nature. The first season is my favorite because of the Ice Truck Killer, aka Brian Moser, aka Rudy Cooper. He is my favorite character in the entire series. The way he left clues and set up imagery pointing to his crime scenes and how he approached Dexter to join him in criminal ventures were incredible.
His performance was outstanding, and the season was amazing because of him. The first time we see him introduced casually, with no one suspecting him to be the Ice Truck Killer, makes him even more amazing.
Season 2
Dexter's life takes a dangerous turn as his secret activities come under threat when divers discover the underwater graves of his past victims. With the Miami Metro Police hunting the "Bay Harbor Butcher," Dexter must evade suspicion while struggling with his relationships and his urges. Complicating matters, his girlfriend's suspicious new friend, Lila, becomes increasingly involved in Dexter's personal life. When the series protagonist suddenly becomes the central antagonist of most of the season, with several twists and turns thrown into the mix, you know you're watching good television. Purely epic Dexter.
My absolute favorite. I enjoyed every episode!
I loved Season 2 so much! Definitely the best. Seasons 6 and 4 are a close second and third, though.
Season 5
Following a devastating personal loss, Dexter finds himself drawn to a traumatized woman named Lumen, who survived brutal attacks from a group of men. Together, they seek revenge on her tormentors while Dexter tries to cope with his grief and maintain his double life. As Dexter gets closer to Lumen, he faces challenges from his colleagues and a persistent detective determined to expose him.
Season 7
Dexter's carefully constructed world begins to unravel when his sister, Debra, discovers his dark secret. As Deb struggles to accept the truth, Dexter becomes entangled with a dangerous mobster, Isaak Sirko, and a young woman named Hannah who shares his darker tendencies. The season explores Dexter's relationships and moral boundaries as he attempts to maintain control over his life and impulses. Seasons 7 and 8 were quite boring, as Hannah's character felt dumb to me and wasted screen time. Her role didn't make sense, as it was established throughout the show that Dexter didn't have the same empathetic feelings or sympathy for his relationships. Suddenly, Hannah is supposed to be accepted by him, which felt forced and like a poor attempt to replace Rita, who was irreplaceable.
Overall, it was a lame season. Isaak Sirko was a cool role but was overshadowed by the Hannah stupidity throughout the season.
Season 3
Dexter tries to control his deadly urges by forming a unique friendship with Assistant District Attorney Miguel Prado, who discovers his secret. Together, they target criminals who escaped justice, but their partnership grows strained as Miguel's moral boundaries dissolve. Dexter realizes he may have created a monster in Miguel, leading to a deadly confrontation.
Season 6
Dexter faces a new foe known as the "Doomsday Killer," who commits religiously motivated murders inspired by apocalyptic visions. As he investigates, Dexter questions his own beliefs and the idea of passing on his dark legacy to his son. The case pushes Dexter into uncharted psychological territory, with devastating consequences for those around him. This is my third-favorite season, right after seasons 1 and 4. It has a great plot twist, and the central villain is amazing. Travis Marshall, aka the Doomsday Killer, was an incredible character, and his manifestation of James Gellar as his dark passenger made the season even more intriguing.
After season 4, something this well-written was bound to happen again, but the series went downhill after this season.
It was better than Season 8. I don't know how the heck that's above this.
Season 8
Dexter contemplates leaving his dark past behind when a neuropsychiatrist, Dr. Vogel, re-enters his life, claiming to understand his nature and introducing him to the idea of a "Code." Dexter's relationships and sense of purpose are tested as he faces personal losses and increasing scrutiny from Miami Metro. The final season builds toward Dexter's ultimate reckoning with his choices, ending his journey in an unexpected way. Oliver Saxon, aka Daniel Vogel, aka The Brain Surgeon, was a good role and had a good storyline. However, none of it mattered because Hannah took up too much screen time, spoiling this season as well as the previous one. The essence of the show was ruined in seasons 7 and 8 due to Hannah. The show spiraled downward because Dexter was made to care for her, which destroyed the original Dexter's story and the written work as a whole.
The ending to this season was horrible, low-key, and without any powerful premise, not ending on a high note. Despite the lame Hannah moments, the poor ending, and the weakness compared to previous seasons like 1, 4, and 6, this season is somewhat watchable because of Oliver Saxon's role, but that's about it.