Galidor: Defenders of the Outer Dimension (commonly shortened to Galidor) is a science fiction television series created by Thomas W. Lynch and The Lego Group, and co-produced by CinéGroupe and the Tom Lynch Company in association with YTV. Galidor premiered on February 9, 2002, and ran for twenty-six episodes across two seasons, airing its last episode on August 24, 2002. It had limited reruns on other international networks. The series follows teenager Nicholas "Nick" Bluetooth and his friend Allegra Zane after they are transported to the Outer Dimension, where Nick uses his newfound "glinch" shapeshifting ability to aid resistance efforts against the tyrant Gorm who has conquered the Outer Dimension in search of the hidden realm of Galidor.

The concept for Galidor as a toy line with an associated television series was created by the Lego Group, hoping to break into a new merchandise market during a period of financial trouble. The concept was brought to Lynch in 2000, who created the story and characters and initially planned out a five-season story arc. The series began filming in September 2001 at the Cine Cite studios in Montreal with a budget of US$16 million. The show combined practical effects and live actors with puppets and green-screen CGI. The series saw minimal attention, and mixed reviews both at the time and in retrospect due to its plot and focus on special effects. The franchise was a commercial failure, though the toys gained a cult following in later years.