The Venture Bros. - Season 3 - Eps 1: Shadowman 9: In the Cradle of Destiny
The wait is over. The truths and half-truths about Dr. Venture's former arch nemeses, Dr. Girlfriend and The Monarch, are finally revealed (albeit obliquely) in an episode spanning twenty years.
About The Venture Bros.

Title: The Venture Bros.
First Air Date: 2004-08-07
Last Air Date: 2018-10-08
Status: Canceled
Rating: 7.78/10 (from 200 votes)
Language: EN
Seasons: 8
Total Episodes: 81
Network: Adult Swim
Genres: Animation, Comedy, Action & Adventure, Sci-Fi & Fantasy
Production Companies: Williams Street, Titmouse, World Leaders Entertainment, Astro Base GO!
Synopsis
Hank and Dean Venture, with their father Doctor Venture and faithful bodyguard Brock Samson, go on wild adventures facing megalomaniacs, zombies, and suspicious ninjas, all for the glory of adventure. Or something like that.
Cast

Doc Hammer
Dr. Girlfriend / Henchman 21 (voice)

Christopher McCulloch
Hank Venture / The Monarch (voice)

Patrick Warburton
Brock Samson (voice)

James Urbaniak
Dr. Venture (voice)

Michael Sinterniklaas
Dean Venture (voice)