Trick-or-Treat with Angelina Ballerina! For Halloween, Angelina and her friend Alice make glorious firefly costumes—complete with delicate wings and tiaras. Angelina's little sister, Polly, wants to be a pretty firefly too. But Angelina thinks she's too little. Polly settles for dressing up as a ghost, and on Halloween night, gives Angelina a surprise scare!