The Callistos go on an expedition to Jupiter's moon Europa.

Fiona Bishop
Loretta Castillo (Voice)

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Dee Bradley Baker
M.E.R.C. / Misc. (Voice)

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Tom Kenny
Leo Callisto / Misc. (Voice)

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Olivia Munn
Phoebe Callisto (Voice)

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Grey DeLisle
Stella / Queen Gemma / Misc. (voice)

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Diedrich Bader
Admiral Crick / Misc. (Voice)

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Danny Jacobs
Admiral Watson / Misc. (Voice)

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Justin Felbinger
Miles Callisto (Voice)

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