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Currently you are able to watch "Underground Monster" streaming on Peacock, Peacock Premium, The Roku Channel, Tubi TV for free with ads or buy it as download on Amazon Video, Vudu. It is also possible to rent "Underground Monster" on Amazon Video, Vudu online
Underground Monster: Near a remote town, the repeated dumping of toxic waste causes an underground cave dweller to mutate into a hideous monster. A construction team that is digging a tunnel accidentally disturb the creature's habitat causing it to attack.