Who is the most fearsome prehistoric beast?

Tyrannosaurus Rex, Land of the Lost (2009)

King Kong, King Kong (2005)

Spinosaurus, Jurassic Park III (2001)

Velociraptor, Jurassic Park (1993)

Pteranodon, One Million Years BC (1967)

Sabretooth Cat, 10,000 BC (2008)

Rhedosaurus, The Beast From 20,000 Fathoms (1953)

Mantis, The Deadly Mantis (1957)