The Giant Blue Iguana is a large blue iguana seen in Ray Harryhausen film, One Million Years BC. It is the first monster seen and attacks the disgraced caveman, Tumak. It chases him up a cliff but eventually loses interest and wanders off.
Later during the film's climax the Iguana falls through a crack in the ground caused by the Volcano and is presumably killed.
- Although the lizard is real, the tongue movements were Harryhausen's work.