But after approaches by an aggressive possum, and an attempted capture, the pair's rescue mission was aborted.
This morning, Mr Isaac tweeted: "For those of you following along at home, our new plan is to return this evening with a humane trap, skilled professionals and some KFC."
Today, one of Adam's crew visited the cat with food.
The singer songwriter has vowed to donate money to a shelter that can "care for her and get her a forever home."
Ryan Adams is in New Zealand for two shows - one tonight in Auckland and another in Wellington on Thursday.
Adams is a self-proclaimed animal lover and contributed to a compilation album that was sold in 2012 to raise funds for an abandoned kitten that needed surgery.