JoJo and Gran Gran

It's Time to Make a Volcano (7x8)

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JoJo and Gran Gran are enjoying a Captain Chloe adventure in which she travels to see a volcano. Afterwards, Great Gran Gran calls to teach JoJo all about real-life volcanoes, and Gran Gran has a plan. Why don’t they make a mini volcano of their own? They get to work building it - and it even erupts!