What was Pixar's first Cars spin-off television series called?

Pixar's first Cars spin-off television series was called Cars Toons: Mater's Tall Tales.

The series consists of short animated episodes centered on Mater's exaggerated stories about his past adventures. Each tale usually begins with Mater claiming that he participated in an unlikely event, such as a musical performance, a rescue mission, or an encounter involving famous characters. Lightning McQueen often listens and responds, even when the story becomes increasingly improbable.

Cars Toons first appeared in 2008, with shorts released through television and other Disney distribution outlets. The episodes are much shorter than the theatrical Cars films and use comedy built around Mater's unreliable storytelling.

The title is sometimes confused with Cars on the Road, a later Disney+ series released in 2022. Cars on the Road follows Lightning and Mater on a road trip, whereas Mater's Tall Tales focuses on individual stories told by Mater.