John Abbott
John Abbott , born John Albert Chamberlain Kefford, was an English actor who worked steadily from the thirties to the eighties, amassing dozens of television guest appearances, and movie roles – almost a hundred and fifty total. He was particularly active in sixties television, with guest appearances in many of the shows of that era. He played Ayelborne in the  first season episode .

Abbott filmed his scenes on Thursday  at Desilu Stage 9, Friday  at the "Arab Village" section of the 40 Acres backlot, Monday , Tuesday  at Stage 9, and Thursday  at Stage 10.

Nine months after filming "Errand of Mercy", Abbott coincidentally uttered (at 13:50) that TOS episode title to Vince Howard in the Bewitched episode "Samantha's Da Vinci Dilemma".

He lent a quiet dignity to the roles he played, even in relatively weak plots like . According to William Blackburn, Abbott was a very professional, Shakespeare-trained classic actor. (TOS-R Season 1 HD DVD Special Features)

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Performers
TOS performers