The Crystal Contingency

Ella and Tilly race their cars on the ceiling at H.O.M.E. Station when Mom runs out on an errand. While she is out, the girls unwittingly crash their cars and smash Mom's crystal. It must be replaced! The girls head out to a Diamond Planet where Ella battles a pulsar. Finding crystals is a lot harder than she thought. When she learns there are more diamond planets, Madhu and Slippy come to help. The next planet is hot enough to melt metal but when Tilly reveals she packed her race car, she saves the day!