- Justin Felbinger as Miles Callisto
- Dee Bradley Baker as M.E.R.C./Adorbix/Luminex
- Fiona Bishop as Loretta Callisto
- Ivy Bishop as Mirandos
- Issac Brown as Haruna Kitumba
- Sam Lavagnino as Blodger Blopp
- Diedrich Bader as Admiral Crick/Falco Computer/Sly
- Danny Jacob as Admiral Waston/Bobble Blopp/PA voice
- Buzz Aldrin as Commander Copernicus
- Tom Kenny as Leo Callisto/Blibby Blopp
- Olivia Munn as Phoebe Callisto
- Grey DeLisle as Stella
- Kevin Michael Richardson as Prosperos
- Cree Summer as Maya
- Keith Ferguson as Koa
- Adrian Grenier as Captain Joe Callisto
- Audrey Wasilewski as Miss Baker/Technician Bot
- Manny Montana as Zeno
- This is the third half hour-length episode in the series, followed by "Galactech: Secrets of the Black Hole" and "Galactech: The Mystery of the Dinosaurs".
- Copernicus is voiced by former astronaut, Buzz Aldrin, one of the first two humans to land on the Moon and the namesake of Buzz Lightyear.
- Miles, Loretta, Blodger, Haruna and Mirandos complete their final Cosmic Explorer mission in this episode.
- Miles' dream to become a captain has come true as of this episode.
- This episode features a different closing sequence.
- Miles, Loretta, Haruna, and Mirandos are seen with new haircuts in this episode.
- In this episode Mirandos' last name is revealed to be Ariellian, which is also the name of her species.
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