Generator Rex A Brief History of Time (2010–2013) Online
- Original Title :
- A Brief History of Time
- Genre :
- TV Episode / Animation / Action / Adventure / Comedy / Drama / Sci-Fi / Thriller
- Year :
- 2010–2013
- Directror :
- Christofer Graham
- Cast :
- Daryl Sabara,Grey Griffin,John DiMaggio
- Writer :
- Paul Giacoppo,Rob Hoegee
- Type :
- TV Episode
- Time :
- 23min
- Rating :
- 8.5/10
Van Kleiss ended up in the past and is being pursued. He struggles to find a way back to his own time.
| Episode credited cast: | |||
 | Daryl Sabara | - | Rex (voice) |
 | Grey Griffin | - | Dr. Holiday (voice) (as Grey DeLisle) |
 | John DiMaggio | - | Bobo Haha / additional voices (voice) |
 | Troy Baker | - | Van Kleiss (voice) |
 | Jennifer Hale | - | Black Knight (voice) |
 | Freddy Rodríguez | - | Caesar (voice) |
 | Hynden Walch | - | Breach (voice) |
| Rest of cast listed alphabetically: | |||
 | Corey Burton | - | Septimius Severus / Additional Voices (voice) |
 | Wally Kurth | ||
 | Fred Savage | - | Noah (voice) |
 | J.K. Simmons | - | White Knight (voice) |