A senior officer at Sea Base 4 who is secretly an agent for the opposing superpower bloc. He collaborates with Solow to sabotage the base's computers using Maddox. After killing Maddox, he takes Tegan hostage but is blinded with a UV device and subsequently executed by attacking Sea Devils.
Nilson serves as a senior officer under Commander Vorshak but secretly acts as an enemy saboteur.
Nilson and Solow form a covert alliance to sabotage the base from within.
Nilson orders the execution of Karina to silence her suspicions about the sabotage.
The Doctor directly confronts and neutralizes Nilson's sabotage efforts.
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