Former war veteran and hot rod enthusiast Larry and his wife, Carmel, take a weekend off from the children to vacation in Paradise, a retreat on the outskirt, rural area of Australia that includes pleasurable amenities such as fishing, swimming, and being an ideal location for a dirty weekend between two lovers, but an Earthquake triggers a major nuclear leak at Waldo, an international nuclear waste storage facility who aims to coverup to radioactive contamination. Heinrich Schmidt, an engineer who was deeply exposed to the waste flees from Waldo’s goons to reveal to anti-nuclear agencies the corporation’s dastardly concealments and warn locals of the tainted public water supply. With not much time to live and suffering from a serious head injury, Schmidt, with partial amnesia, is sheltered by an unsuspecting Larry and Carmel as they help him piece together his life while Waldo sends recovery and murderous thugs to quiet those who wish to leak information. Paradise is anything but as trouble brews between the vacationing Larry and Carmel, the witless locals, and Waldo in disclosing radioactive waste streaming through the water passage ways.

“The Chain Reaction” is the freshman film of writer-director Ian Barry released in 1980. Produced by “Mad Max’s” George Miller, “The Chain Reaction” was considered an unrelated companion piece that also starred a number of the same actors, but the action-thriller aligned more with the populistic nuclear disaster genre of the late 1970s and early 1980s. Whereas George Romero focused on accidental biological effects in his 1973 science fiction horror, “The Crazies,” Barry honed in on nuclear waste disaster and the reaction of those responsible, to what length of measures would be necessary and taken to keep exposure from happening. Caught in the middle are locals and unfortunate vacations, who actually take more a stand against tyrannical, above the law organizations. “The Chain Reaction” is packed with exciting car chases and glazed with testosterone enriched standoffs on a nuclear level.

Steve Bisley steps into the lead role of hot shot Larry Stilson working his solid strong physique with a general moral, but still bad boy composure when unravelling and thwarting the Waldo conspiracy. Bisley costars alongside the late Arna-Maria Winchester. Winchester screams screen time sauciness, but as a mother of two, Winchester’s Carmel Stilson comes off as promiscuously uncharacteristic as a mother but, to be fair, Larry doesn’t necessarily yell conventional father either. However, I’m impressed by the turncoat engineer Heinrich Schmidt played by Ross Thompson, an Australia actor who can really accent well the German language and puts into his role a languishing, broken man trying to do the right thing. Together, the Stilson’s and Heinrich are tracked down by Waldo henchman Gray, portrayed by English actor Ralph Cotterill (“Howling III”). Cotterill’s menacing, stodgy dagger eyes make him a suitable villain, but falters in the screen time department, seeing not much action as needed to take care of monumental business against possible exposure. Huge Keays-Byrne (“Mad Max: Fury Road”), Richard Moir (“The Odd Angry Shot”), Laurie Moran, Lorna Lesley (“The Survivor”), and a cameo of Mel Gibson round out of the cast.

The overall problematic crux with “The Chain Reaction” stems from that director Ian Barry is no George Miller when presenting his own version of pacing a film. The narrative is casually abrupt and edited shoddily with very rough and hard to follow sequential events that are supposed to be a fiery ball of nuclear mishandling and underhandedness fury. Though highly doubtful Umbrella Entertainment took the censorship scissors to this Ozploitation flick, there are moments of bizarre, if not expurgated, cuts that debase the illustrative graphic violence. One particular moment in the climatic third act, a shotgun was only aimed to intimidate would be attackers, but never discharged. However, a character is seemingly gunned down with a blood splattered mid-section being the only clue of his demise, but like aforementioned, the shotgun was never fired. Barry’s riveting action story plays out mostly like this, reducing the action to a meager narrative withstanding only a few good car chase sequences, some character intimacy, and laced with some shrouded mystery.

Umbrella Entertainment presents under their Ozploitation Classics’ sublabel, Ian Barry’s “The Chain Reaction” onto a full High definition, 1080, region free Blu-ray with a widescreen 1.85:1 aspect ratio. Honestly, a slightly cleaner and re-refined release was expected. Natural grain is expected, but the lossy definition and blurriness could have been tweaked for optimal results on the print. No edging enhancements nor print damage detected surrounding the fair natural coloring, skin tones, and, sometimes, vivid photography from Russell Boyd (“Picnic at Hanging Rock”), which is surprisingly rather bland overall. The DTS-HD Master Audio dual channel track is excellent with upfront and clear dialogue, ample ambient range, and a clean harrowing and resonating classic disaster scenario score composed by Andrew Thomas Wilson in his sole composure credit. Bonus features are aplenty with extended Not Quite Hollywood interviews with stars Steve Bisley and Arna-Maria Wichester, director Ian Barry, and producer Ross Matthews, a couple of featurettes entitled Thrills & Nuclear Spills and The Spark Obituary, deleted and extended scenes, an early cut with alternate title of “The Man at the Edge of the Freeway,” and media spots from theatrical release, TV, VHS trailer, and image gallery. “The Chain Reaction” is far from noxious, but the nuclear disaster piece could have been more radiant, a quality very difficult to achieve deep in the midst of so many great titles similar in the genre category; yet, the Ian Barry action thriller is an entertaining adversity excursion nonetheless.