Following the tragic death of Dr Braddock and his wife in what appeared to be a lab accident, the house passed into the care of the three younger Braddocks, but Brian (now the superhero Captain Britain) eventually discovered that his parents had actually been murdered by Mastermind, a holographic projection of an insane supercomputer which Dr Braddock had unwisely installed in the basement. Captain Britain defeated Mastermind only to see his home supposedly flattened by a missile strike carried out by the agency S.T.R.I.K.E. (Special Tactical Reserve for International Key Emergencies), but years later he returned to what he believed would be its ruins, only to find that the manor was still standing, its destruction having been just another hologramatic hoax perpetrated by the Mastermind computer, which had also mentally enslaved the Braddock family's housekeeper Emma Collins for years in order to maintain it.
Reprogramming the computer and freeing Emma (who later died as a result of brain damage caused by her enslavement), Brian took up residence in the Manor once more, using the computer (now a mass of living crystalline circuitry covering an underground cavern) as a resource to assist in his crimefighting. The Manor was briefly used as a headquarters by the intelligence agency the R.C.X. (Resources Control Executive) but is now the Braddock Academy, a school for young superhumans.
- Captain Britain (Brian Braddock)
- Mastermind (formerly)
- Jamie Braddock (formerly)
- Betsy Braddock (formerly)
- Saturnyne (formerly)
- Special Executive (formerly)
- Excalibur (formerly)
- Doctor James Braddock (deceased)
- Lady Elizabeth Braddock (deceased)
- Emma Collins (deceased)
- Tom Lennox (deceased)
- Alison Double (formerly)
- R.C.X. (Resources Control Executive)
- Mick, the groundskeeper
- Braddock Manor first appeared in Captain Britain #9 (December 1976), when it was described as having been built 250 years ago, "on land that's been part of the Braddock heritage since before the Romans came."