"S.P.D.. Special Police Dekaranger. Five detectives who fight cool with burning hearts. Their mission: To combat space criminals who invaded Earth. They will protect the peace and safety of all humanity!"
The story begins when Banban Akaza arrives on Earth to the city of Megalopolis. He is transferred to the S.P.D. (Special Police Dekaranger) Earth branch by his commander. By that time, Agent Abrella, an Alienizer arms dealer, turns his destructive attention to Earth, helping the criminals there. It's up to the Dekarangers to stop them and bring them to justice. The S.P.D. of Earth are stationed in the DekaBase under the command of Doggie Kruger.
All episodes in this series are directly called "Episode.", with every episode title in English; these titles are transliterated into Japanese katakana. All titles are separated into "two words"; those that appear longer are due to a certain phrase used in one of these words (such as "High Noon" of "High Noon Dogfight", where the "High Noon" is kept together, while the "Dogfight" is made into the separate, second word).
Part of this season's title, Deka, means "ten". This season also features 10 Rangers.
"Deka" is also the Japanese slang term for "detective".
Dekaranger has several homages to Metal Heroes. The "Tokusou" in the name, the narrator who repeats the same description every single episode (and was once self-parodied within the show), and a birdman in charge of the organization are all references to Metal Heroes, especially to that of the Space Sheriff Trilogy.
The Dino Thunder special Dino Thunder the Lost Episode shows several shots of Dekaranger footage not used in the US, and at one point you can see the faces of 4 of the Dekarangers as they transform.
Pop idol Shoko Nakagawa had a guest starring role in Episode 38.
Dekaranger is the first Super Sentai series (and the third Tokusatsu overall, after Ultraman Tiga in 1996 and Kamen Rider Kuuga in 2002) to win the Media prize Seiun Award, which is given to the best science-fiction work of either the movies or television for the year.
Dekaranger is the second Sentai series since Fiveman where the female ranger's uniforms do not have skirts.
Dekaranger was originally going to be named "Sirenger".
The Dekarangers are currently the only Sentai in which every ranger is called by a nickname.
Similar to Denziman, the Dekaranger gain their powers from an alien source with many of the members recruited by a dog; likewise said dog, Denzi Dog IC, was a robot akin to assisting teammate K-9 Murphy.
Akin to Bioman, likewise the Dekaranger are recruited and assist in powers that are alien in nature. However, this series also has concepts such as the heroes having numerical designations in combat (with only Green and Blue switched between Bioman (where Green is "2" and Blue is "3") and Dekaranger (Blue is "2", Green is "3") as well as the main villains mostly relying on giant robots to fight the main mecha of the allies.
There is also a slight similarity in concept with Gekisou Sentai Carranger'sSignalman, who likewise is a policeman from space akin to the universal police organization the Dekaranger are depicted in this series.