Godzilla: The Series S02E12 - Shafted

On their way to an expo in an attempt to win a research patent, the team meets a lost young girl named Meg. She asks the team to rescue her two brothers Steven and Kevin, who went into a silver mine where a gang of miners disappeared without trace fifty years before. While Monique is left babysitting Meg (much to her displeasure), the rest of the team encounters the Silver Hydra: a monster capable of encasing anyone unfortunate to meet it in silver, and able to regenerate itself every time it is harmed. Now the race is on to defeat the Hydra before Kevin, Steven, Elsie and Godzilla end up as lifeless silver statues.