Guest Stars Georgina Leahy voices Stella Don Darryl Rivera voices Wally Wackford Maxwell Atoms voices Loo Loo Co Starring Maxwell Atoms voices Additional Voices Jayden Libran voices Additional Voices Richard Steven Horvitz voices Additional Voices Juliana Sada voices Baby Octavia Dashiell McGaha-Schletter voices Additional Voices Uncredited Alex Brightman voices Robo Fizz