The more comical sequel series, Fight! Mighty Jack (戦え！マイティジャック, Tatakae! Maiti Jakku), aired on the same network from July 6 to December 28, 1968, with a total of 26 half-hour episodes, equaling the original in length. This series has several humorous references to the early Ultra Series. The opening scene of the series (with a reverse paint-swirling effect forming "MJ" before a burst of red envelops the scene, with a yellow "Fight! Mighty Jack" superimposed) is almost exactly like that of Ultraman. One episode of this series is quite notable, as it features a comical guest appearance by Kohji Moritsugu, who played Dan Moroboshi, the alter-ego of Ultra Seven, poking fun at his popular role. He plays a mechanic, who, in one scene, looked as though he was about to transform into Ultra Seven by pulling the Ultra Eye from his pocket to put it on, but the red object he slowly pulls from his pocket is actually a small wrench, with which he gets right to work on fixing a machine.
Episodios
1. Beat the Trap!
2. Blow Up MiniMini Island!
3. Leap into the Sea of Evil!
4. Take Back What Was Stolen!!
5. Chase After the Statue of Maria!!
6. Strike Hard with the Mighty-Go!
7. Just Try Coming At Us!
8. Go to Hell Laughing!
9. Beat the Evil Out of the Earth!
10. Solve the Mystery of the Disappeared Princess!!
11. Give the Half-Assed Bomb All You've Got!
12. Take Back Mighty-Go! (Part 1)
13. Take Back Mighty-Go! (Part 2)
14. Cross the Blazing Sea!
15. Charge the Hall of Corpses!
16. Protect the Client!
17. They got away! Go, catch them!
18. Beat the H-Bomb Dinosaur!!
19. Hold Off the Human Garden!
20. Expose the Space Ninja
21. Unmask the Spirits!
22. Raise the White Flag on Tokyo Tower
23. Mark the Lady Assassin!
24. Change Course to Happening Island!
25. Leap Toward the Sky of Hope! (Part 1)
26. Leap Toward the Sky of Hope! (Part 2)
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