I Spy is an episode in The Sleepover Club. It tells the story of The Sleepover Club after Krystal dumps Caitlin as a friend, causing Jess to take pity on her and invite her to hang with the SOC. But Krystal sees this as a way she can use to her advantage and gets Caitlin to try and find out the SOC secrets. The SOC find out about Krystal's plan and luckily Caitlin and Krystal don't find out any of their secrets.