A Challenge to the Underground 1 Season 29 Episode

Episode #1

Ultra Operation No. 1

Episode #2

Defeat the Invaders!

Episode #3

Sally Forth, Science Patrol!

Episode #4

5 Seconds Before The Big Explosion!

Episode #5

Treasure of the Miloganda

Episode #6

The Coast Guard Command

Episode #7

The Blue Stone of Baradhi

Episode #8

The Lawless Monster Zone

Episode #9

Operation: Lightning Speed

Episode #10

The Mysterious Dinosaur Base

Episode #11

The Ruffian from Outer Space

Episode #12

The Cries of the Mummy

Episode #13

Oil S.O.S.

Episode #14

The Pearl Oyster Protection Directive

Episode #15

The Terrifying Cosmic Rays

Episode #16

The Science Patrol to Outer Space

Episode #17

Passport to Infinity

Episode #18

The Brother from Another Planet

Episode #19

The Demons Once More

Episode #20

Terror on Route 87

Episode #21

Break Through the Smoke!

Episode #22

The Underground Destruction Work

Episode #23

My Home is Earth

Episode #24

The Undersea Science Base

Episode #25

Mystery Comet Tsuifon

Episode #26

Monster Majesty (1)

Episode #27

Monster Majesty (2)

Episode #28

Human Specimens 5 & 6

Episode #29

A Challenge to the Underground

Episode #30

The Snowy Mountain of Illusions

Episode #31

Who Has Come?

Episode #32

The Endless Counterattack

Episode #33

The Forbidden Words

Episode #34

Gift From the Sky

Episode #35

The Monster Graveyard

Episode #36

Don't Shoot, Arashi!

Episode #37

The Little Hero

Episode #38

The Spaceship Rescue Command

Episode #39

Farewell, Ultraman!