During the Siskel and Ebert run, the two adopted the same format they had used in their previous series Sneak Previews which ran on PBS: two critics from opposing newspapers view clips from the week's new movies, discuss them, then pass judgment expressed in thumbs up (to approve) or thumbs down (not worth seeing). During this run they would adopt several elements that would make the show lively. For example, they would bring on Spot the Wonder Dog to help the critics lead into "The Dog of the Week", the week's worst movie. Later, they used another animal Aroma the Educated Skunk. Plus, the critics would also occasionally feature an "X-Ray segment" in which they discussed current trends happening in the movies. None of these extra elements were carried over when the show moved to Buena Vista and became Siskel & Ebert.