youtu.be/YJ2WKHPKwxA?...

There's an English dub, but it's only currently available on the HBO GO app in Australia. Seems to have Sentai Filmworks VAs, but there's no dub credits.

Episode 25 was dubbed.

At least two of those shows (three if you're talking about Thundercats 2011) were tax writeoffs, so mountains would need to be moved to air them.

Generator Rex is the only one I'm uncertain of.

My picks of retro anime that weren't on Toonami:
Lupin the Third Part 1
Lupin the Third Part 2
Future Boy Conan
Saint Seiya
Magic Knight Rayearth
Slayers
Vision of Escaflowne
Case Closed
Berserk (1997)
Serial Experiments Lain
Cybersix
Kikaider
Overman King Gainer
Cromartie High

My pick of anime that previously aired on Toonami:
Voltron
Ronin Warriors
Gundam Wing
Outlaw Star
The Big O
The 08th MS Team
Dragon Ball
G Gundam
Yu Yu Hakusho
Cyborg 009
Gundam SEED
Bobobo-bo Bo-bobo
Blue Dragon