Recycled in Space/Anime and Manga

Demashita! Powerpuff Girls Z is Powerpuff Girls AS AN ANIME!
Mutant Turtles: Choujin Densetsuhen is Teenage Mutant Ninja Turtles AS AN ANIME!
Digimon Adventure 02 is Digimon Adventure THREE YEARS LATER!
Gankutsuou is The Count of Monte Cristo IN SPACE!
- Studio Gonzo loves these. In addition to Gankutsuou, Gonzo is also responsible for these:
  - Samurai 7 is Seven Samurai WITH MECHA!
  - Basilisk is Romeo and Juliet WITH MUTANT NINJAS!
  - Romeo X Juliet is Romeo and Juliet ON A Floating Continent!
G Gundam is Street Fighter WITH GIANT ROBOTS
Hakugei: Legend of the Moby Dick is... Moby Dick IN SPACE!
Odin: Photon Sailer Starlight, also known as Odin: Starlight Mutiny, has elements of Mutiny on the Bounty IN SPACE! Doubly invoked in that it was produced by the guys that created Space Battleship Yamato (also known as Star Blazers). Recycled in space, indeed.
Gun Frontier is literally Captain Harlock (or one of his Identical Ancestors) IN THE OLD WEST!
The Wonderful Galaxy Of Oz is The Wonderful Wizard of Oz IN SPACE!
Yu-Gi-Oh Capsule Monsters is Yu-Gi-Oh!! WITH Mons!
- Yu-Gi-Oh! 5D's is Yu-Gi-Oh!! WITH MOTORCYCLES!
- Yu-Gi-Oh Zexal. "Card Games on Rocket Ships!"
Dragonball Z is Dragon Ball IN SPACE, WITH ALIENS!
- Dragon Ball GT is Dragonball Z WITH EVEN MORE SPACE - and with Kid Goku, thereby recycling stuff from the original DB as well!
Lost Universe is Slayers... IN SPACE! Not the same characters or anything, but it IS set in the same universe.
Starzinger is Journey to the West . . . [IN SPACE]!
Machine Robo Rescue is Thunderbirds WITH GIANT ROBOTS
The planned series Lupin VIII, had it been completed, would have been Lupin III, IN SPACE, IN THE FUTURE.
Hyper Speed GranDoll is Sailor Moon IN SPACE!
Sayonara, Zetsubou-sensei is Mahou Sensei Negima WITHOUT MAGIC (AND Darker and Edgier)!
Lucky Star is Azumanga Daioh WITH OTAKUS!
Daitarn 3 is James Bond WITH TWICE THE BOND GIRLS AND A GIANT ROBOT!!