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In the second episode of the four-part story "Galaxy 4," the Rills and the Dravins of the planet Galaxy continue their centuries-old feud as their planet draws nearer and nearer to destruction. Inasmuch as both races hope to use the TARDIS to make their escape, it is only logical that the Doctor's traveling companion Steven (Peter Purves) is taken hostage. In trying to rescue their friend, the Doctor and Vicki (Maureen O'Brien) must first locate the Rill stronghold. Written by William Emms, "Trap of Steel" originally aired on September 18, 1965; this episode apparently no longer exists.