On this day, 30 April 1977: Jinty
In this Gypsy Rose one-off story, schoolgirl Cassie Allen rescues a black cat which was being teased by bullies, and, with the help of a kindly old neighbour, looks after the cat and feeds her milk and chicken. The mog pays them back by destroying the neighbour's furniture and eating her goldfish. Gypsy Rose tells Cassie that it was probably a witch's cat. I'm not sure what the moral of that one was, but it made for a nice cover.