Telesdon

Telesdon (テレスドン) is a prehistoric, somewhat worm-like monster that was controlled by The Underground People. Telesdon was unleashed to terrorize a city on the surface world, as well as distract the Science Patrol from the Underground People's real plan. The Underground People had captured and attempted to hypnotize Shin Hayata into using Ultraman as their own weapon. However, they underestimated Ultraman's power and Ultraman escaped and defeated the Underground People and Telesdon.