Early Doctor Who regeneration scenes were based on a bad LSD trip, BBC memos suggest.

According to The Sun, the transformation of The Doctor were inspired by the dark effects of the hallucinogenic drug.

The memo, dated May 1966, apparently outlines how original Doctor, William Hartnell, would be transformed for his successor, Patrick Troughton.

It reads: "The metaphysical change... is a horrifying experience - an experience in which he relives some of the most unendurable moments of his long life, including the galactic war.

"It is as if he has had the LSD drug and instead of experiencing the kicks, he has the hell and dank horror which can be its effect."

The memo continues: "His hair is wild and his clothes look rather worse for wear (this is a legacy from the metaphysical change which took place in the Tardis)."

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