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When Kate kills Medusa's sister, Medusa exacts vengeance by striking out at Kate's boyfriend; Nick skirmishes with the Gorgon, and Kate must race to find an antidote before her partner turns to stone.
When Cupid's 'love potion' causes a hangin' judge to start setting high-end criminals free, it's up to Kate and Carl to get an on-the-lam Cupid back to Chicago to reverse his potion's' effect on both the judge and a transformed Nick, whose newfound propensity for seeing the good in everyone begins to wear thin on his colleagues.
A Link with mind control powers sets off a crime spree using children as the perps. When Nick and Kate's investigation leads them to a really annoying kids show host, they send a bitterly reluctant Carl undercover as the host's sidekick to discover - and destroy - the Link's power.