On This Day (USA) - 11 September

Galaxy 4: Four Hundred Dawns premiered on BBC One in 1965 at 5:41pm BST, watched by 9.00 million viewers.

The Doctor and his friends meet the Chumblies and the Drahvins.

The Masque of Mandragora: Part Two premiered on BBC One in 1976 at 6:07pm BST, watched by 9.80 million viewers.

The Mandragora energy joins forces with the secret Brotherhood of Demnos. Count Federico plots to steal the Dukedom of San Martino from his nephew, Giuliano.

The 100 Greatest TV Moments premiered on Channel 4 in 1999 at 9:00pm BST

Prologue premiered on BBC One (BBC iPlayer) in 2015 at 12:00pm BST

Troy Glasgow will be 38 - credited as Angelo in The Time of Angels / Flesh and Stone

Troy Glasgow played Angelo in the Doctor Who story The Time of Angels.

Born in Waterloo in 1984, Troy Glasgow attended The Brit school in 2001, graduating in 2003. Whilst here he gained small roles in favorites such as The Bill, Doctors and Holby City. 

He gained his first lead role in the Channel 4 one off drama in 'Sex, footballers and videotape'. After stints at the National theatre, Birmingham Rep theatre and an acclaimed cameo in Brit Hit 'Adulthood', he went on to to appear in Skins, Doctor Who and The Day of the Triffids.

He now continues to work consistently, with two small upcoming appearances in Brit flick, 'Piggy' and the upcoming blockbuster 'World War z'.

Lachlan Nieboer will be 41 - 2 credits, including Gray in Exit Wounds(TW)

Lachlan Nieboer, born  in Epsom, Surrey, England, UK, played Gray, Jack Harkness's long-lost brother, in the Torchwood episodes Fragments and Exit Wounds. His other credits include the short film Heartland and the television drama Vivaldi.

Biography from the TARDIS wiki article, licensed under CC-BY-SA   

Edwin Richfield (died 1990 aged 68) would be 101 - 2 credits, including Captain Hart in The Sea Devils

Edwin Richfield  was an English actor.

He had two major roles in Doctor Who, playing Captain Hart in the 1972 story The Sea Devils  and Mestor in the 1984 story The Twin Dilemma.

His film credits include: X the Unknown,Quatermass 2, The Camp on Blood Island, The Face of Fu Manchu and Quatermass and the Pit.

He starred in the 1959 television series Interpol Calling. He was The Odd Man in Granada TV's series of the same name in the early 1960s. Other television roles include: R3, 199 Park Lane,Gideon's Way, Danger Man, The Avengers (six episodes), Dixon of Dock Green, Z-Cars, Adam Adamant Lives!, The Baron, Champion House, Out of the Unknown, The Owl Service, UFO,Bergerac, and All Creatures Great and Small.

Bernard Spear (died 2003 aged 83) would be 103 - credited as Man with Carrier Bag in Daleks' Invasion Earth 2150 A.D.(Aaru)

Bernard Spear was an English actor.

He played the man with the carrier bag in Daleks' Invasion Earth 

He was born to a Polish father and Russian mother.

Spear starred in the BAFTA TV Award-winning television play Bar Mitzvah Boy, and also appeared in the films Bedazzled and Chitty Chitty Bang Bang. In 1968, he played the dual roles of Cervantes's manservant and Sancho Panza in the London stage version of Man of La Mancha.

Fenella Fielding (died 2018 aged 90) - credited as Narrator in Carnival of Monsters(Factual)

Fenella Fielding  is an English actress, popular in the 1950s and 1960s. 

She is known for her seductive image and distinctively husky voice.

Hugh David (died 1987 aged 62) - 2 credits, including Director for The Highlanders

Hugh David was an actor turned television director. 

His directorial credits include Compact, Z-Cars, The Pallisers and Doctor Who, for which he directed two stories in the Patrick Troughton era.

 While still an actor in the early 1960s, he had turned down the role of the First Doctor, when it was offered to him by his friend, the producer Rex Tucker. David later stated that as he had recently starred in the Granada Television series Knight Errant and disliked the high public profile it brought him, he was not keen to take on another leading role. 

Works included Sophia and Constance, Grange Hill, Une maison, une histoire, Of Mycenae and Men, Blue Peter Special Assignment, The Clifton House Mystery, Everyman, Centre Play, Rooms, The Velvet Glove, Luke's Kingdom, Dominic, Boy Dominic, Beryl's Lot, The Pallisers, Cranford, Clouds of Witness, Thirty-Minute Theatre, Wives and Daughters, Masterpiece Theatre, Trial, Jude the Obscure, Doomwatch, Z Cars, Christ Recrucified, The Expert, The Man in the Iron Mask, The Further Adventures of the Musketeers, 199 Park Lane, Compact, Zero One, Suspense, Richard the Lionheart, Tarnished Heroes, Knight Errant Limited, ITV Television Playhouse, A Matter of Degree, Armchair Theatre, How Green Was My Valley, BBC Sunday-Night Theatre, A Quiet Man, Television Playwright, The Invisible Armies, The Supreme Secret, Dixon of Dock Green, The Buccaneers, Reach for the Sky

He was married to Wendy the time that The Ark In Space was filmed.