Season 1
1998 · 51 episodes
Gamu Takayama is a 20 year old member of an organization called Alchemy Stars. After a monster known as C.O.V. attacked the Earth, Gamu falls through a portal of light and meets the giant: Ultraman Gaia, who gives him his powers. Later, when Gaia was in trouble in episode three, another Ultraman, Ultraman Agul appeared. Can they save the Earth? Who is Agul, is he friend or foe? Later in the series it is seen that Agul, too, is a being of justice, but only protects the Earth, not humanity. The conflict between the two later leads to a duel, opening a wormhole that allows a giant beast to reach Earth. What will happen then?

Episodes

1. Seize the Light!
5 Sept 1998
After Gamu Takayama briefly encounters the mysterious glowing red giant During some virtual reality experiments. The Root of Destruction begins its first wave of attacks on Earth.

2. A Hero Appears
12 Sept 1998

3. His Name is Gaia
19 Sept 1998

4. Gamu of the Sky
26 Sept 1998

5. Another Giant
3 Oct 1998

6. The Ridiculing Eye
10 Oct 1998

7. The Cleansing of the Earth
17 Oct 1998

8. The 4,600 Million Years-Old Ghost
24 Oct 1998

9. Seagull Takes Off
31 Oct 1998

10. Rock Fight
7 Nov 1998

11. Dragon Capital
14 Nov 1998

12. Monster Encircling Net
21 Nov 1998

13. Night of the Marionettes
28 Nov 1998

14. The Challenge from the Anti-Space
5 Dec 1998

15. When the Rain Stops
12 Dec 1998

16. Birth of Agul
19 Dec 1998

17. Shadow of Space, Light of Earth
26 Dec 1998

18. Agul vs. Gaia
9 Jan 1999

19. Lilia's Maze
16 Jan 1999

20. The Fossil of Ruin
23 Jan 1999

21. The Sea of a Mysterious Light
30 Jan 1999

22. Wings of a Stone
6 Feb 1999

23. Gamu Expelled!
13 Feb 1999

24. The Determination of Agul
20 Feb 1999

25. Showdown for Tomorrow
27 Feb 1999

26. Final Resolution
6 Mar 1999

27. A New Battle
13 Mar 1999

28. The Advent of the Heatwave
20 Mar 1999

29. The Distant City: Uqbar
27 Mar 1999

30. The Demon's Cocoon
3 Apr 1999

31. The Accursed Eye
10 Apr 1999

32. The Future Seen Before
17 Apr 1999

33. Battling the Legend
24 Apr 1999

34. Crash of Souls!
1 May 1999

35. Ransom for a Monster
8 May 1999

36. The Sky of Reunion
15 May 1999

37. The Fourth Symphony of a Nightmare
22 May 1999

38. Ground-Breaking Tusks
29 May 1999

39. Lake of Sadness
5 Jun 1999

40. I Want to See Gaia!
12 Jun 1999

41. Resurrection of Agul
19 Jun 1999

42. Gamu vs. Gamu
26 Jun 1999

43. The Silver Eyes of Izak
3 Jul 1999

44. Attack of the Space Monsters
10 Jul 1999

45. The Living Planet
17 Jul 1999

46. The Attack of the Forest
24 Jul 1999

47. X.I.G. Destroyed!?
31 Jul 1999

48. Revenge of the Death God
7 Aug 1999

49. An Angel Descends
14 Aug 1999

50. The Cry of the Earth
21 Aug 1999

51. Earth is Ultraman's Home
28 Aug 1999
Ultraman Gaia Season 1: quick answers
How many episodes are in Ultraman Gaia Season 1?
Season 1 of Ultraman Gaia has 51 episodes.
When did Ultraman Gaia Season 1 come out?
Season 1 premiered on 5 Sept 1998.