J.A.K.Q. Dengeki Tai (ジャッカー電撃隊, Jakkā Dengeki Tai), translated as J.A.K.Q. Blitzkrieg Squad is the second Sentai series. Unlike most of the other Sentai which start out with a team of 5 members the JAKQ team started out with only 4. A fifth member (Big One) appeared in episode 23. J.A.K.Q. Dengeki Tai was not nearly as popular as Goranger, only running for 35 episodes. J.A.K.Q. Dengeki Tai is the second and final sentai created by Shotaro Ishinomori.
J.A.K.Q. or JAKQ comes from Jack, Ace, King, Queen. The J.A.K.Q. team members are named after playing cards. Their leader goes by the code name of "Joker".
There are no giant monsters or giant robots to fight them in J.A.K.Q. Dengeki Tai. CRIME uses human sized monsters assisted by masked soldiers called Crimers. CRIME also has bat-winged aircraft called Devil Sharks.
JAKQ was the final Sentai series to use only the Sentai name. Afterwords the name "Super Sentai" was used. (Wikipedia)