Tokusou Sentai Dekaranger

Tokusō Sentai Dekaranger (特捜戦隊デカレンジャー), translated into English as Special Investigation Squadron Dekaranger, was the 2004 Super Sentai Japanese TV series. Deka is Japanese colloquial slang for "detective" and has no direct translation, but is sometimes written over the kanji for "Keiji" (a more formal term for detective); it is also a Greek prefix "deca," meaning "ten," and a total of ten Dekarangers appear in the series and movie combined. The footage from the show was used to create the American series Power Rangers: S.P.D.

Plot
"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!" (S.P.D..スペシャル ポリス デカレンジャー. 燃えるハートでクールに戦う五人の刑事たち. 彼らの任務は地球に侵入した宇宙の犯罪者たちと戦い、人々の平和と安全を守ることである!)

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 SPD of Earth are stationed in the DekaBase under the command of Doggy Kruger.

SPD Fire Squad

 * Leonian Gyoku Rou (47-50)
 * K-9 Murphy/D-Bazooka (5-50)

SPD Staff

 * Supreme Commander Horusian Numa-O (21-50)
 * Porupo (1, 36)
 * Tortorian Buntar (32-33, 36)
 * K-9 Clarence

Allies

 * Hikaru (7-8)
 * Zamuzan Myra (9-10)
 * Ocarnan Amy (12)
 * Flora/Meria (15-16)
 * Zoinaian Baytonin (18)
 * Shinnooian Hakutaku (25, 34, 49)
 * Slorpean Faraway (30)
 * Chanbenarian Gin (34, 49)
 * Detective Chou (35)
 * Mikean Teresa (37)
 * Falufian Yaako (38)
 * Bakuryuu Sentai Abaranger (Tokusou Sentai Dekaranger vs. Abaranger)
 * Mahou Sentai Magiranger (Mahou Sentai Magiranger vs. Dekaranger)
 * Nagisa Misumi and Honoka Yukishiro/Cure Black and Cure White (Tokusou Sentai Dekaranger/Futari wa Pretty Cure Audio Drama

Space Criminals Alienizer

 * Rainian Agent Abrella (2-50)
 * Mechanoids
 * Igaroids (8-50)
 * Batsuroids
 * Anaroids

Monsters

 * Minor Alienizers
 * Heavy Industrial Machines

Others

 * Machine Monster Gigas (15-16)
 * Space Life Form Browgouls (42-43)

Arsenal and Mecha

 * Arsenal (Dekaranger)
 * Mecha (Dekaranger)

Trivia

 * Dekaranger is the first Super Sentai series in which the gender ratio is equal, out of the total ten Dekarangers, five are male and five are female.
 * 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 in the show), and a birdman in charge of the organization are all references to Metal Heroes, especially the Space Sheriff shows.
 * 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 orignally going to be named Sienger
 * Several Dekaranger concepts and ideas appear to homage concepts from several earlier Super Sentai series, in particular Denshi Sentai Denziman and Choudenshi Bioman.
 * 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's Signalman, who likewise is a policeman from space akin to the universal police organization the Dekaranger are depicted in this series.
 * This is the first sentai that all core rangers and the sixth ranger are referred to by nicknames instead of their real names.