I really dug the creativity of this adventure.  I ran it for my high school group (the Sentinels) back nearly 30 years ago, and again in the early 90's (almost 20 years ago) for Justice Force:

#34 – Demon Invasion – A tropical storm off the east coast of Florida grows quickly in speed and intensity, and is soon realized to be an entirely new phenomena.  Days later, a concussive shockwave from the Vortex causes many of the planes observing it to be lost at sea and affects weather patterns around the world.  C.H.E.S.S. sends in Imperial, Meganaut, and Telecomm, who transmit back that the Vortex is centered around a bizarre framework construction, hovering over the ocean floor and sucking in everything around it like a small black hole.  Strange creatures are seen on the towers, working on machines, then communication with the heroes is lost.  Panic spreads among the public as scientists reveal that in fourteen months most life on Earth will be destroyed!  The U.N. launches a massive nuclear warhead into the squall with no effect.  Russia sends in their superhero Gravitron, who creates an opposing black hole that causes another incredible blast.  The Vortex and Gravitron both disappear, and the area returns to normal.  An adrift fishing trawler emerges with tales of horrific monsters that slew and ate their crewmates; they claim that a great explosion sucked the beasts in and then they witnessed demons and the Devil himself!  C.H.E.S.S. tells all heroes to remain on alert, then King Homer Grimsby alerts Justice Force that a second mysterious tower is being built at Stonehenge.  Banished eons ago to the dimension of Chaosia (the Devil's Domain), the powerful entity known as the Devil orchestrates giant matter vacuums on three different worlds (Earth, Xareon, and Targo) to feed millions of demons that will form a living link, allowing his escape (which is possible only every 666 years).  As Spectre, Tempest, Mirage, Freeze, and Kamikaze fly in a loaned supersonic jet to Great Britain, they see the Devil's image in the sky, commanding them to turn back.  Next they face a wave of mystic turbulence from Overseer, then multiple flying demons that explode into noxious brown smoke when defeated.  They arrive at Stonehenge, where a black, four-story structure rises 300 feet above the ancient ruins.  The heroes battle their way up, besting human zombies from many different eras of history.  As they ascend, they destroy strange gigantic machinery that the undead had been constructing.  On the third deck they dodge large objects that Overseer teleports at them through a misty portal.  At the top, they overcome many different demons, who explode into a brown liquid that becomes smoke.  Later, this demon ichor entrances the local townspeople, temporarily causing them to go into a killing frenzy toward those unaffected.

#35 – Lost Tomb of Cor – Justice Force receives international praise and rewards for their bravery.  C.H.E.S.S., still concerned, presents the team with a vial of the demon ichor.  Research and analysis reveals it to be an alien organic compound that affects human brain chemistry in its gaseous form.  Records show only one previous encounter, during a reign of terror by Glenn Jocco (Obituary), who nearly dominated the world with it over fifty years before.  The heroes fly to Easter Island to talk to the former terrorist, but the old man yells mad ravings and threats as they approach.  From his tiny hut, surrounded by giant stone heads with glowing red eyes, four demons spring at the vigilantes.  After a short battle, the five men subdue Obituary, destroy the creatures, and recover a powerful magical weapon called a Soul Sickle.  Inside the house, they find his diary and a locked chest which cannot be moved.  A key is found on the madman, and inside the box is a dank hole with an overpowering stench and nightmarish screams.  The adventurers travel down a slippery staircase into the Chaos Room, where Tempest and Spectre face deadly illusions until the others persuade them to disbelieve.  They enter the Hall of Ages, which is covered entirely in ancient runes.  Kamikaze deciphers a tale of alien travelers and King Cor besting a great demon, but is cursed in the process.  As they pass through the Well of the Dead, piled high with mummified corpses, they find a bronze key.  A statue of a monstrous warrior blocks a tunnel, then comes to life and attacks!  They defeat the being, and it turns to dust.  The group goes into the Dome of Knowledge, encrusted with jewels that activate images; they see many recordings, including pictures of the Devil and Chaosia.  Suddenly three statues of beetle-men become animated and assail them with pikes!  The champions dispatch the Horrors and find a hidden door which leads into the Gate of the Dimensions.  That room has a carpet of squirming maggots, and the key found earlier fits into a painting of a large wooden door, revealing a glowing energy field.  Each person is asked what they seek, and Spectre chooses power.  He then steps through the portal to Rome circa 45 B.C., the era of Gaius Julius Caesar.  Though gone for hours, only seconds have passed for the others when they retrieve him.  Frustrated that their leader has likely fractured the timestream, the group decides to confront the Devil and enters the gateway.

#36 – Devil's Domain – The team steps through to Chaosia, a bizarre dimension with characteristics and natural laws different from Earth; the atmosphere and air are thicker, gravity is more intense, and the soil and rocks are composed of diamond-hard crystals.  The group moves east all day across the endless plains of the Fields of Glass and wards off different groups of creatures; during one fight they also struggle against a wave of fear.  At night, demonic beings assault their camp, but each time they are able to defeat them.  The next day they continue to travel and are still occasionally attacked by strange beasts.  Finally they reach the Coral Forest, where the dangerous terrain forces them to slow down and the monster encounters become more frequent.  Some fall into a deep sleep in the Somniferous Forest, but their teammates are able to wake them.  Hours later, the heroes rescue the sentient Brain Core of the Coral from an assault by more demons; in return it heals their wounds.  After many hours, they reach the Scarlet Orb, a large, metallic hovering sphere at the center of the forest.  The champions overpower ten Boogen guards, then use a control booth to enter the top of the structure.  On the upper level, they pass through a torture chamber, find strange and exotic devices and equipment, ward off a tiny robot, and briefly clash with Overseer, who teleports away.  They descend in a lift to the next level, a maze of twisting tunnels and dead ends that appear to be the interior of a living being.  Discovering storage for the demon ichor and a treasure trove guarded by three Abominations, the group chooses to press on to the bottom level.  There they find an opulent throne room of spectacular grandeur, as well as the Devil, Overseer, and many demons.  Quickly the two sides engage in combat, and Justice Force finds that the large, charismatic Devil is by far the most dangerous foe they have ever faced.  The battle starts to turn against the vigilantes, and Tempest and Mirage fall to their more powerful adversaries.  Suddenly, Freeze teleports behind the Devil and hits him with the Soul Sickle, trapping his essence inside of it!  The ghost of Cor appears and offers a wish to each hero: Freeze asks for the defeat of the demons, Spectre chooses wealth, and Kamikaze requests repair for the timestream.  Each wish is granted, and the victors leave the Soul Sickle (and trapped Devil) under the ancient spirit's care.  They make their way to a demon bridge, where they exit the realm and return home.