Müller is a rogue scientist from the planet Newton and was the former head of the Müller Royal Laboratories.

Eleven months after the grand finale of Fairy Tail, master mangaka Hiro Mashima is back with a great adventure beyond imagination! All the steadfast friendship, crazy fighting, and blue cats you've come to expect... IN SPACE! 
 
A young boy gazes up at the sky and sees a streaming bolt of light. The friendly, armor-clad being at his side tells him gently, "That's a dragon." The fact that he's joking isn't important. What's important is the look of wonder on the boy's face... and the galaxy-spanning adventure that's about to take place! Join Hiro Mashima (Fairy Tail, Rave Master) once more as he takes to the stars for another thrilling saga! 
 
(Source: Crunchyroll)
 
Note: The first two episodes received an online advance screening on March 29. Regular TV broadcast started on April 11, 2021.

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He provides the Japanese dubbed voice of Rick Sanchez from Rick and Morty and Dr. Heinz Doofenshmirtz from Phineas and Ferb.

Eleven months after the grand finale of Fairy Tail, master mangaka Hiro Mashima is back with a great adventure beyond imagination! All the steadfast friendship, crazy fighting, and blue cats you've come to expect... IN SPACE! A young boy gazes up at the sky and sees a streaming bolt of light. The friendly, armor-clad being at his side tells him gently, "That's a dragon." The fact that he's joking isn't important. What's important is the look of wonder on the boy's face... and the galaxy-spanning adventure that's about to take place! Join Hiro Mashima (Fairy Tail, Rave Master) once more as he takes to the stars for another thrilling saga! (Source: Crunchyroll)