Exponential Cross-Field System

A critical TARDIS navigational system that demonstrated exponential instability during the materialization sequence. The Doctor exploits this malfunction to force an emergency river landing, knowing the field’s collapse would risk catastrophic decompression. No visible components are described, but the system’s erratic behavior forces the crew to gamble on its activation despite the peril.

2 appearances

Appearances in the Narrative

When this object appears and how it's used

2 moments

S18E26 · Logopolis Part 2

Doctor reveals Master's second TARDIS

The exponential cross-field system is halted mid-flight to prevent catastrophic decompression during the partial underwater materialization, accepting risk for the tactical advantage of luring the Master into the open.

Before: Straining under temporal load with erratic flickers visible on the console.

After: Abruptly halted, leaving the ship vulnerable but enabling the dangerous gambit to proceed.

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S18E26 · Logopolis Part 2

Doctor sets underwater trap for Master

The Exponential Cross-Field System demonstrates chaotic instability during materialization, carrying the risk of catastrophic decompression. Its halt by Adric neutralizes immediate peril, making the underwater gambit survivable. The system’s abrupt deactivation is both a relief and a reminder of the thin margin between success and irreversible failure.

Before: Pulsing erratically with destabilized energy, threatening structural failure under temporal strain

After: Halted and stabilized, removing one axis of potential catastrophe from the equation

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