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K9 MARK I was a mobile computer in the shape of a dog, designed by Prof. Marius, to replace his real dog left behind on Earth. K9 was a data bank of considerable capacity. He was also equipped with a blaster for offensive and defensive actions. His blaster could kill, stun or paralyze living beings, and melt or disintegrate metal. K9 was shown to be capable of regeneration. He could interface with the TARDIS, the Matrix and other machines.

K9 MARK I helped the Fourth Doctor and Leela against the Virus of the Purpose, which briefly infected him. When Prof. Marius found out that he could not take K9 back to Earth with him, he asked the Doctor to take him (4T). K9 then accompanied the Doctor and Leela on their travels, and helped them fight the Sunmakers and the Oracle.

K9 frequently irritated the Doctor by proving that his data banks were full of far more accurate information than the Time Lord's own memory.

After helping the Doctor free Gallifrey from the invading Vardans and Sontarans, K9 MARK I chose to remain with Leela on the planet of the Time Lords (4Z).

The Fourth Doctor built a K9 MARK II, which had greater mobility and would respond to a silent dog whistle. K9 MARK II accompanied the Doctor and Romana on the Quest for the Key to Time. He fought the Graff Vynda-K, the Captain of Zanak's Polyphase Avatron, Vivien Fay's Ogri, and interfaced with the Mentalis machine, but was unable to take part in the battle on Delta Magna's moon because of its swampy terrain (5A-5F).

Later, speech circuit defects (or space laryngitis) prevented K9 from helping the Fourth Doctor and a newly-regenerated Romana against the Daleks and Scaroth. But he soon joined them against Lady Adrasta, the Mandrels, the Nimon, Pangol and the Foamasi, Meglos, the Marshmen (who severely damaged it) and the Great Vampire (5J-5P). K9 MARK II was gravely disabled by the Time Winds during the Doctor's battle with Rorvik and elected to stay in E-Space with Romana and the Tharils (5S).

The Doctor sent an already assembled K9 MARK III as a present to Sarah JaneSmith. He helped her defeat a coven of witches who worshipped the pagan goddess Hecate in Moreton Harwood (K9 & Company). K9 MARK III tried to warn Sarah Jane of Borusa's time scoop, but was ignored (6K).

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John's many and various television credits include "Doctor Who", "The "Wedding Feast", "The Doctors", "Dad's Army", "Take Three Girls", "Rings on Their Fingers", "My Wife Next Door", "The Reverent Wooing of Archibald", "Marry the Girls", "Sorry", "Tucker's Luck", "The Prince Regent", "Crown Court", "The Brief", "On the House", "Rainbow", "Game for a Laugh", "The Prince and Mrs. Fitzherbert", "The Barretts of Wimpole Street", "Oscar", "Ring of Bright Water (And Beyond)", "Dear Mother Love Albert", "Crossroads", "Indelible Evidence", "Beadle's About", "The Bill", and "Blake's Seven". He also appeared in the movie "Tarka the Otter".

He has performed in a wide variety of plays including "The Chiltern Hundreds", "Ten Little Indians", "Miss Carraway Investigates", "The Hollow Crown", "The Taming of the Shrew", "Wuthering Heights", "Give a Dog a Bone", "As You Like It", "A Winter's Tale", "Hay Fever", "The Rivals", "MacBeth", "Hindle Wakes", "The Deep Blue Sea", "Diary of Anne Frank", "A Doll's House", "That Scoundrel Scapin", "Measure for Measure", "Hobson's Choice", "Julius Caesar",

"The Hostage", "Much Ado About Nothing", "Plaza Suite", "Flint", "Don't Start Without Me", "See How They Run", "Sweet Wine of Youth", "Bedroom Farce", and "Hamlet".

John has worked for many years as a freelance narrator for BBC promotional trailers, radio commercials, film commentaries and has recorded a cassette language course for Cambridge University Press and Macmillans. He has also worked as the Continuity Announcer on Channel 4 in Britain.

At his first American convention, when fans hadn't yet seen the face behind the voice, John spent half a day 'in disguise' as American fan 'Fred' complete with button-bedecked scarf and hat. He entered the K-9 sound alike contest and won! It wasn't until he took the stage for his panel session that fans realized his 'little deception'. Nowadays, having appeared at numerous conventions both here in the United States and in Britain, John is far too recognizable for a repeat performance.

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