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One of the Third Doctor's Companions.  Doctor Elizabeth Shaw was seconded from her post at Cambridge to UNIT as scientific advisor. She began working for Brigadier Lethbridge-Stewart during the first Nestene invasion, alongside a newly-regenerated Doctor (AAA).

She became the first assistant of the Third Doctor, whom she helped against the Silurians, the so called Ambassadors of Death, and the forces unleashed by Professor Stahlman's Inferno.  During that adventure, the Doctor met her alternative counterpart, Section Leader Shaw (DDD). 

Argumentative and irritable with those in authority, she was loyal and dedicated to the Doctor, determined to learn as much as possible from him. Disgusted by UNIT's actions in sealing up the Silurian base (BBB), she rarely hid her biting sarcasm from her superiors.

She left soon afterwards when the opportunity arose, returning to Cambridge, feeling that the Doctor did not require another scientist to pass him test tubes and pass comment on his own brilliance. Her image was used by Rassilon to ward of the Third Doctor in The Five Doctors (6K).

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Caroline John was born and raised in a family whose roots were in the entertainment industry, her father ran a theater and her mother was a dancer and actress. She trained at the Central School of Speech and Drama, after which she spent several years in the theater, including tours with the Royal Shakespeare Company and the National Theatre first in Ipswich, then Sheffield, Southwold, Worcester, Exeter, and the Oxford Playhouse. 

Her stage credits include such notable productions as "King Lear", "Rosencrantz and Guildenstern are Dead", and "The Merchant of Venice". She also played 'Hero', the young lover, in a production of "Much Ado About Nothing" directed by Franco Zeffirelli.

She decided she want to get into television and so sent her photograph out to the appropriate people. This resulted in no interest whatsoever. So she got her picture taken while sitting on a ladder in a bikini and sent that photo around, with far more gratifying results.

One of those photos ended up in the Doctor Who production office. After a successful interview, she landed the role of Dr. Elizabeth "Liz" Shaw. However, she was on the show for only a comparatively short time: the powers-that-be thought that her character was a little too intelligent for the viewers and couldn't serve as the traditional "person to whom the Doctor explains things." She had also become pregnant during this period (something she had to take pains to hide) and so left the show after a single season.

She took some time off in the late 70's to care for her growing family with actor-husband Geoffrey Beevers, best known to Doctor Who fans as the decaying Master in "The Keeper of Traken." (He also appeared with Caroline in "The Ambassadors of Death" as Private Johnson, the radar technician who picks up the Doctor's SOS signals.) As her children grew older, she returned to acting, appearing in such television productions as "The Hound of the Baskervilles" (with Tom Baker, freshly departed from his role as the Doctor, as Sherlock Holmes), "A Perfect Spy", "The Choir", "Gaudy Night", and "In Suspicious Circumstances", plus appearances in long-running television productions such as "Poirot", "EastEnders", and "The Bill".

She briefly reprised the role of Liz Shaw in "The Five Doctors" in 1983 and in the BBC's Children In Need skit "Dimensions in Time" in 1993. Bill Baggs Video Productions has also resurrected the character of Liz Shaw and spun her off into her own direct-to-video series P.R.O.B.E., in which Liz and a character played by Louise Jameson investigate paranormal activities. There have been four installments so far: "The Zero Imperativ"e, "The Devil of Winterborne", "Unnatural Selection", and "The Ghosts of Winterborne". Geoffrey Beevers also appears in the series.

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