Forever breaking into song and dance, musicals are fun, fun, fun. They are primarily what folks go to for uplifting entertainment, are they not? Actually, many of the best aren't anything like that simplistic. Opening at the Young Vic last night, The Scottsboro Boys is no mere barrel of vacuous laughs, though it is comical and buoyant along the way.

Southwark Playhouse's new production of The Love Girl and the Innocent is London’s first in over 30 years, and there’s a reason Alexander Solzhenitsyn’s play rarely reaches the stage: it’s a lumpy mammoth of a script, demanding a cast upwards of 50, with stage directions that would be monumental if interpreted literally.

There was a sense of nervous anticipation in the Maria, the Young Vic's studio space. Ninety minutes of torture was on the menu, and I'll admit to feeling some trepidation. But this show - and "show" is the right word - turns out to be a revelation. Writers Nicolai Khalezin and Natalia Kaliada, co-founders of Belarus Free Theatre, have pulled off an astonishing coup: their feast for the senses, directed by Khalezin, tells horrific stories without melodrama, without overstatement or buckets of blood - and it is all the stronger for its brilliant mix of matter-of-factness and lyricism.

“The best times I've ever had were in prison,” says Crystal, aged 23, one of the three inmates being followed in The Prisoners (this was originally planned as episode one, but was bounced from the schedules by the death of Baroness Thatcher). On the brink of being released after serving a 12-week stint for drink-related crimes, she's waxing nostalgic, while her girlfriend Toni – also due out very soon – is in tears. “I'm dreadin' getting out,” she quavers.

While it’s impossible to know the effect of Captured on the few who originally saw it, you can be damn sure it packed a punch. It still does. This unforgettable film was made in 1959 for the Army Kinema Corporation to train personnel in resisting interrogation. Classified as “restricted”, it was seen only by a relevant and limited forces audience. Instead of making a dry, instructional film, director John Krish fashioned a drama with clearly defined characters and a slow-burn intensity which climaxes disturbingly.

Shakespeare’s Julius Caesar, set in an Italian prison, performed by criminals? If it sounds like a gimmick, the Taviani brothers’ Caesar Must Die is anything but. Following a popular tradition of freshening up Shakespeare's works with a shift in setting or location (think 10 Things I Hate About You or Ran), the Tavianis' deft editing creates a lean and intriguing 76 minutes that outstrips three hour epics in meaning and depth.

Television is a regular prison visitor. You can’t keep Louis Theroux out of the grimmest Stateside penitentiaries, the drama departments drop in now and then for a stretch inside – most recently in Prisoner’s Wives. And then there’s ITV. A couple of years ago it reported from Wormwood Scrubs to find out how the prison system was coping in Brown’s Britain. It wasn’t the prettiest sight. The channel turns its attention to Aylesbury, a young offender institution heaving with the sort of hoodies the Prime Minister may not after watching this first episode feel quite so inclined to hug.

For all its ruminative merits, Richard Vergette's drama is not the “searing political thriller” it purports to be. It raises lots of interesting questions, but they get in the way of any deep emotive power.

Although tinged throughout with blue, the Norwegian drama King of Devil’s Island is so grim it might as well be grey. Basing it on real events pitches the film as a cautionary tale, but the message is hard to determine. Everything shies away from explanation. Norwegians might have the context, but the rest of us need to fill in the gaps.

Into the Abyss sees celebrated German filmmaker Werner Herzog take a sharp turn away from those marvels of early man he so magnificently captured in the stereoscopic Cave of Forgotten Dreams to the shocking violence of which humanity is also capable, here both greed-fuelled and state-sanctioned. It’s a documentary which takes as its focus a multiple homicide and is both an anatomy of a (triple) murder and a passionate, if frequently askew, petition against the death penalty.