S7E25
Tragic
Written by Don Houghton
View Graph

Inferno Part 7

When Professor Stahlman accelerates a dangerous drilling project to penetrate the Earth's crust, despite warnings, the Doctor, just returned from a parallel world, must stop him before his reckless actions trigger a global catastrophe that will transform humanity.

Episode Seven of Inferno sees the Doctor return from a parallel dimension just as Professor Stahlman pushes forward with his dangerous drilling project. Diagnosed to be in a coma, Liz and the Brigadier are shocked when he repeats concerns that Sutton voices nearly simultaneously. He warns of a blown number two output pipe, proving they must act quickly. While the Doctor is unconscious, the pipe bursts, forcing Liz and Sutton to consider the Doctor’s solution: reversing the systems. They agree, and it temporarily works.

Upon regaining consciousness, the Doctor tries to warn everyone about the impending disaster, but his frantic behavior leads to him being labeled as insane. He's restrained after he attacks the central control console with a wrench. Sir Keith Gold, who has survived his car crash, arrives and orders an inquiry into Stahlman’s conduct, but Stahlman remains undeterred, continuing the drilling operation.

As the drilling progresses, Stahlman orders everyone out of the drill head and locks it down. Green ooze begins to seep from the number two output pipe, transforming Stahlman into a monstrous creature. He demonstrates his transformation when he smears it on his face and starts to growl like an animal on the comms. Liz repairs the computer, which now confirms the Doctor's warnings, advising an immediate halt to the drilling. Stahlman, fully transformed, attacks, but the Brigadier shoots Stahlman. The Doctor and Sutton use CO2 fire extinguishers to subdue the creature. Petra initiates an emergency shutdown, but buffer controls mean the effects will persist for five minutes.

The Doctor and Sutton race to the drill head, where they find the server switches destroyed. As the final countdown commences, the Doctor desperately works to reconnect the wires. The countdown stops with only thirty-five seconds remaining. The immediate danger averted, Gold orders the shaft be filled in abandonment of the project. Sutton and Petra leave together, hinting at a romantic connection. Finally, the Doctor attempts to use the nuclear reactor again to fix the TARDIS, but after trading insults with The Brigadier, he vanishes, and then reappears a few seconds later in a rubbish tip, needing help retrieving his TARDIS.


Events in This Episode

The narrative beats that drive the story

30
Act 1

The Doctor returns from a parallel dimension, found unconscious in his workshop by Liz Shaw and Sergeant Benton. Liz diagnoses him with a coma, while the Brigadier expresses skepticism about his condition and location. Simultaneously, Professor Stahlman, driven by an obsessive and increasingly reckless ambition to reach "penetration zero," orders a further acceleration of the dangerous drilling project. He dismisses safety warnings from his assistant, Petra, and engineer Greg Sutton, who both express grave concerns about exceeding established safety margins. Sutton specifically warns Stahlman about a faulty emergency flange on the number two output pipe, arguing it could blow at any moment given the accelerated drilling rate. Stahlman, however, insults Sutton and dismisses his expertise, accusing him of creating "transparent excuses for delay." Sutton, frustrated, threatens to abandon the project, but Petra's concern for him hints at a deeper connection. An alarm blares, and smoke and green ooze erupt from the drill head, confirming Sutton's dire predictions. At this precise moment, the comatose Doctor, seemingly clairvoyant, mutters warnings about the "number two output pipe blown" and urgently instructs them to "reverse all systems immediately." Liz, recognizing the Doctor's uncanny prescience, rushes to Central Control. She proposes the Doctor's radical solution to a disbelieving Sutton and Petra, who, despite their initial skepticism, implement the system reversal. The maneuver temporarily stabilizes the situation, much to Stahlman's indignation, who confronts Petra for acting without his orders. This initial crisis highlights Stahlman's dangerous leadership and foreshadows the Doctor's crucial, if unconventional, role in the unfolding catastrophe.

Act 2

The Doctor awakens from his coma, immediately inquiring about a "berserk technician" and Stahlman's condition, revealing his recent experience in a parallel world where he witnessed similar catastrophic events. He frantically warns Liz, the Brigadier, and the newly arrived Sir Keith Gold—who survived a car crash orchestrated by Stahlman—of an impending global disaster, asserting he has "already seen it." Gold and the Brigadier dismiss his warnings as delirium, leading the Doctor to slam down a phone and declare he is "not sick" or "a raving idiot." In Central Control, the Doctor confronts Stahlman, demanding an immediate halt to the drilling. When ignored, he attacks the central console with a wrench, attempting to physically stop the operation. Soldiers restrain him, and he is labeled "demented" and taken to the sick bay, though he manages to tell Liz about a missing micro circuit in the computer. Sir Keith Gold initiates an inquiry into Stahlman's conduct, but Stahlman remains defiant, continuing the drilling. In the drill head, Stahlman experiences intense pain and cold, ordering all technicians out and locking himself inside. Green ooze seeps from the number two output pipe, and Stahlman smears it on his face, growling like an animal as he undergoes a grotesque transformation. Liz, having repaired the computer, obtains a printout that confirms the Doctor's earlier warnings, explicitly advising an immediate halt to the drilling. Despite this evidence, Gold hesitates to give the shutdown order, citing a lack of authority. The transformed Stahlman, now a monstrous creature, bursts into Central Control and attacks. The Brigadier shoots him, and the Doctor, alongside Sutton, uses CO2 fire extinguishers to subdue the creature. Petra initiates an emergency shutdown, but buffer controls mean the drilling will persist for another five critical minutes, setting a new, urgent ticking clock.

Act 3

With the dangerous drilling operation still active and the countdown ticking due to buffer controls, the Doctor and Sutton race against time to the drill head. They discover the server switches, crucial for a full shutdown, are completely destroyed. As the computer's voice announces the final countdown, the Doctor desperately works to reconnect the severed wires, his efforts intensified by the looming threat of catastrophe. In a climactic moment, he successfully reestablishes the connection, and the countdown abruptly halts at minus thirty-five seconds, averting the immediate global disaster. A wave of relief sweeps through Central Control; Liz hugs the Doctor, and Petra embraces Sutton, signifying the immense tension released. Sir Keith Gold, recognizing the severity of the averted crisis, immediately orders the shaft to be filled in and the entire project officially abandoned. In the subsequent resolution, Sutton and Petra depart together, their shared ordeal forging a clear romantic connection. The Doctor then attempts to harness the site's nuclear reactor to repair his TARDIS, a persistent endeavor throughout his adventures. However, a final, sharp exchange of insults with the Brigadier—who accuses the Doctor of causing trouble and being "pompous, self-opinionated"—precedes the Doctor's abrupt vanishing with the TARDIS console. Seconds later, he reappears a few hundred yards due east, in a rubbish tip, his TARDIS still malfunctioning and in an "inaccessible position." The Brigadier, despite their earlier spat, is compelled to assist the Doctor in retrieving his recalcitrant time machine, concluding the episode on a note of characteristic Doctor Who absurdity and the enduring, if exasperated, partnership between the Doctor and UNIT.