Interesting, but horrific Indiana Jones and the Temple of Doom is the second (chronologically first) Indiana Jones movie, following Raiders of the Lost Ark (which I loved). It's set a year before Raiders, in 1935.
But first, some historical background for the movie. The Thuggee - often called the Thugs (where we get our word Thug) were a religious criminal cult that operated in India between the mid-1300s to the mid-1800s. They were quite vicious. Many - probably most - Thugs were Hindus, who targeted caravans (pretending to be travelers to gain the other travelers' trust), killing travelers as a human sacrifice to their goddess Kali. They strangled the person, and afterwards mildly mutilated part of the body. They usually robbed the persons they killed. They often recruited the children of their victims, with the presence of children dampening other travelers' suspicions. A very large minority of Thugs were Muslims who killed - in pretty much the same way - purely for the riches. All were superstitious, however, and believed themselves the offspring of Kali. The British began to learn of the problem in the early 1800s, and began to take action against them. They largely suppressed the Thugs in the 1830s, and they disappeared completely (as far as anyone knows, anyway) in the 1870s.
OK, now that that's out of the way, what about the movie?
Temple of Doom focuses on the evil Thugs, in particular on the area of uncertainty when any cult dies out: do they secretly exist underground?
In the movie, Indiana Jones, Willie Scott and Short Round just escape from Hong Kong after falling afoul of a crime lord. However, the plane they hopped in is owned by the crook! The pilots sabotage the plane and bail out. After failing to stabilise the plane, Indy, Willie and Shortie are forced to bail out over India - just before the plane crashes and explodes.
After an unrealistic (but funny) ride down a mountain on an inflatable rubber dinghy (yes, they bailed out of the plane in that), they come across a village where all the children are missing, and the people are practically starving. They are informed that an evil cult operating unsuccessfully tried to convert them, before burning their crops, stealing their sacred Sankara Stone (which allegedly has supernatural properties), and kidnapping their children. One of the missing children - severely malnourished - returns that night, and reveals he escaped from Pankot Palace. The next day, Indy, Willie and Shortie set off for Pankot.
Indy learns that Pankot Palace was once, a hundred years beforehand, the base for a Thuggee cult. A British army officer is there, investigating reports of a revived Thuggee cult operating out of the palace. Pankot's Maharajah and Prime Minister, Chattar Lal, give them hospitality but, partly to scare them off, serve them with disgusting food that Indians don't normally eat. Lal in particular acts slightly suspiciously - especially when Indy confronts him at dinner about the palace's history, and the evidence for the Thugs operating out of there.
That night, after Willie and Indy (who had been developing romantic feelings for each other) have an argument, a Thuggee assassin attempts to kill Indy, but Indy and Shortie kill him. Indy then goes to Willie's room searching for an assassin there, but doesn't find one. Instead, he finds a secret booby-trapped passageway (crawling thickly with insects - really upsetting Willie) leading to an underground Thuggee temple.
Now, up to this point the movie was really fun to watch. It was quite good. To this day, I would give the first half of the movie a 9 or 10. But from the moment they entered the temple, things changed. It became much darker and more horrific. This is when they introduce the historical Thuggee cult in action.
Indy and Willie stumble across the temple just in time for a human sacrifice. Not the strangling one that the real Thugs did (which would have been uncomfortable to watch), but ripping the heart out (a nod to the mild mutilating the Thugs did) and lowering the poor victim into a lava pit - somehow still alive. It's a very horrible scene to watch. It's shown in as much detail as possible - even reaching into the chest.
From then, it just deteriorates into horror. After the ceremony, Indy tries to take one of the three Sankara stones place in front of the giant (and horribly ugly) idol of Kali. He then discovers that the Thugs are using the kidnapped children as slaves in a mine in horrible conditions (a nod to the historical recruiting of their victims). The trio are captured. After being whipped (along with Shortie), the Thuggee high priest forces Indy to drink blood or something from from a ROTTING SKULL. This again is really uncomfortable to watch. Especially as the drink puts Indy into a trance and makes him an evil slave.
Shortie is made a slave in the mine, while Willie is selected as the next sacrifice. It was at this point that we turned the TV off.
This movie has a really interesting premise - probably more historically based than the other movies in the series. There is certainly a greater threat to the world. As the high priest explained, they are mining for the two remaining Sankara Stones (in addition to mining diamonds and jewels to fund their operation). Once they have all 5, their full power will be unleashed, and they will take over the world for Kali. In his words, "The British in India will be slaughtered. Then we will overrun the Muslims and force their "Allah" to bow to Kali. And then the Hebrew God will fall and finally the Christian God will be cast down and forgotten." I always found that part interesting.
But in the end, the movie (the middle part, anyway) is just too horrific to watch (unless you've got a very strong stomach). I don't know that I'd recommend it (unless you've got a good constitution).