Giant

The Giant is a giant knight monster summoned by Rita Repulsa. So how did she summon him? Well by saying this incantation:

"Moondust soft and pliant, send to Earth a giant!"

Once it appeared in Angel Grove, it pulled the Red Ranger out of Bone's dimension. The Ranger then summoned the Tyrannosaurus Dinozord and soon destroyed the Giant with the ground breath attack.