Richard "Have Gun Will Travel" Boone hops into his drill car, drills under the Arctic, finds a lost valley of dinosaurs, and commences to shootin' because he's a MAN and MEN have to HUNT. A 1977 co-production by the people who brought us "Ultraman" and also the people who brought us "Santa Claus Is Coming To Town", this wild TV movie is jam packed with rubber suit monsters and sweaty sexism (Richard Boone's character is named "Maston Thrust") as everybody involved looks off-camera for that bottle of whiskey they stashed under a fake boulder, or a phone so they can call their agent and get themselves out of this mess.

A modern take on the Frankenstein archetype story. Reason #1 to riff this movie: it stars Keanu Reeves, who I am convinced is a piece of 2x4 lumber dressed in human skin, doing his one-note method acting. Reason #2: certain gaps in logic appear in the film, such as how it takes exactly 17 days to clone a human as he or she appeared at the time the DNA sample was taken, but each progressive day accelerates the aging process. That's just one gap, but there are plenty others scattered throughout the movie. Reason #3: plenty of pauses between dialogue and quiet moments that are perfect for riff-insertion. Watch the movie and judge for yourselves.

Some of my favorite MST3K episodes were the Russo-Finnish fairy tale movies--which even the guys at Best Brains admitted were beautifully filmed. Jack Frost/Father Frost was probably my favorite of the Sci-Fi channel era.

There are loads of other Russo-Finnish fairy tale movies. Many of them have been released on DVD through the company Ruscico; they can also be found on YouTube in their original language (most of them subtitled in English). It would be great for Rifftrax to cover them (or re-cover the ones already done on MST3K), but for the ones you haven't covered yet, it would depend on whether they'd had official English dubs. (I know of some of them which have, such as Through Fire, Water, and Brass Pipes, The Snow Maiden and The Princess And The Pea. I believe the award-winning The Stone Flower may have as well.)

Also, Germany, in the 1950s, made several live-action fairy tale movies that were dubbed into English and released on the kiddie-matinee circuit. Snow White, Sleeping Beauty and Rumplestiltskin were among them. A few of them were shown on the BBC--most notably, The Singing Ringing Tree, which frightened a generation of British kids. (The latter was unusual in that it wasn't so much dubbed as voiced-over: we can hear the original German dialogue while a narrator translates it and tells us what's going on.)

Finally, there have been some fairy-tale movies made in Mexico and released with English dubs--mainly, the Little Red Riding Hood trilogy, released on the kiddie-matinee circuit by our old pal K. Gordon Murray. These three movies (starting off with an adaptation of the original fairy tale and following up with two original stories) feature a couple of familiar faces: the wolf and skunk characters that showed up in the Santa's Village of Madness shorts, also cobbled together by K. Gordon Murray. The third one features Jose Elias Moreno as the Ogre--he played Santa Claus in the infamous Mexican movie. They are all musicals, and the first one features, I kid you not, the skunk serenading a parrot. A fan-made continuation of MST3K covered the first Red Riding Hood movie: check it out at the link featured on http://www.mft3k.com/episodes/F01/index.html. Perhaps you guys could outdo it...

All of these would be great riffing candidates for the same reason the first four Russo-Finnish MST3Ks were: they are often beautifully filmed, with some great visuals and lovely musical scores, but have a fair amount of utter insanity going on as well.

From Wikipedia:

Supertrain is an American adventure-drama television series that ran on NBC from February 7 to May 5, 1979. Nine episodes were made, including a 2-hour pilot episode.

The series took place on the Supertrain, a nuclear-powered bullet train that was equipped with amenities more appropriate to a cruise ship. It had luxuries such as swimming pools, shopping centers, a gym, library, medical center, and a discotheque.[1] It was so big it had to run on very broad gauge track. Though it had a rated top speed of 250 mph (402.34 km/h), and cruised at 190 mph (305.78 km/h), the train took 36 hours to go from New York City to Los Angeles; this would put the train's average speed at around 80 mph (128.75 km/h), slower than that of Amtrak's Acela Express and well below the speeds of bullet trains in Europe and Asia. (Some episodes state, however, that the train also stops in Chicago, Denver, a fictitious town in Texas and presumably other cities, which would extend the length of the run and thus would require faster speeds.) Much like its contemporary The Love Boat, the plots concerned the passengers' social lives, usually with multiple intertwining storylines. Supertrain was described in a 1979 Variety review, "It's a 'Love Boat' on wheels which has yet to get on track."[2] Most of the cast of a given episode were guest stars. The production was elaborate, with huge sets and a high-tech model train for outside shots.
https://www.youtube.com/watch?v=2Av1P8cFVw8
why Rifftrax should riff on it:
1. a pool on a train!
2. a disco on a train!
3. a nuclear-powered train!
and bonus...
it's 1979! It needs to be riffed!