The most star studded before they were stars episode of The Avengers

[Jasha]

My Wildest Dream

Peter Vaughan
John Savident
Edward Fox

[Misspent Boners]

My Wildest Dream

Peter Vaughan
John Savident
Edward Fox

Genuinely never heard of any of those three.

[Gerald Fjord]

i brush my teeth with savident

[biggytitbo]

I brush mine with Peter Vaughan.

[Catalogue Trousers]

Among others, The Superlative Seven has Brian Blessed, Charlotte Rampling, and Donald Sutherland, all well before they became what could be considered properly famous.

[the science eel]

April Showers

Pat Boone
Pat Coombs
Pat Sharp