The Magician's Apprentice (Doctor Who) episode is a blue-and-silver model as first seen in 1963. Clara, upon deducing the Doctor's location and intent, says "Do not go gentle into that good night", the first line of the titular poem by Dylan Thomas. When the Doctor spies Clara and Missy, he plays the opening notes to Roy Orbison's "Oh, Pretty Woman". The Doctor's playing electric guitar and teaching medieval people the term "dude" echoes the movies "Bill & Ted's Excellent Adventure" and "Bill & Ted's Bogus Journey", films featuring two rocker teens who travel back in time – in a telephone call box – and teach
Do not go gentle into that good night the last line of the second and fourth stanzas, and the third line of the first stanza serves as the last line of the third and fifth stanzas. The rhyme-and-refrain pattern of the villanelle can be schematized as AbA abA abA abA abA abAA where letters ("a" and "b") indicate the two rhyme sounds, upper case indicates a refrain ("A"), and superscript numerals ( and ) indicate Refrain 1 and Refrain 2. The pattern is below set against the poem: Do not go gentle into that good night "Do not go gentle into that good night" is a poem in