Sabrina, the Teenage Witch Season 1 Episode 11

After Salem stows away in her backpack and gets her thrown out of the local pizzeria, Sabrina washes her hands of the cat, feigning unconcern when the feline fails to return for Christmas dinner with visiting cousin Monty. When she discovers that Salem has in fact been catnapped by a stubborn little boy named Rex, Sabrina launches a desperate plan to rescue him by impersonating Santa Claus.