Gong Gong and Po Po are the grandparents of Miles and Loretta Callisto in the Disney Junior animated series Miles from Tomorrowland. They are Phoebe's parents, and former members of the Tomorrowland Transit Authority now retired.
Before retirement, Gong Gong worked as an Astronomer for the Tomorrowland Transit Authority. He spent most of his service tracking comments in the TTA observatory. Despite being retired, he still mastered his knowledge of the usage of Holoscreens. He also served as the pilot and navigator aboard The Explorer, before it was lost in ice.
Unable to walk, Gong Gong rides a hoverchair that has rocket boosters.
Before retiring, Po Po was an engineer who designed and built most of the ships used by the Tormorrowland Transit Authority, as well tested them out. Despite being retired, she still masters her engineering skills and knows how to pilot a ship, especially at high speeds. She once served as the engineer aboard The Explorer.
- It is revealed in "Happy Captain's Day" that Gong Gong and Po Po's family name is Liang.
- Since Gong Gong and Po Po mean Grandpa and Grandma in Cantonese Chinese on their mother's side, their actual names currently remain unknown.