Because this is what this thing is, an episode from the main series stretched out to a 44-minutes runtime because again the fetish for TV movies taken from main series of the japanese producers is a real thing hence they felt the need to do this. Clear influences from Dragonball Z are full on display - the alien female villain particularly is "inspired" by C-18 from that anime - and, while not being great on itself, it is at least watchable and not a 100% complete waste of time, more than it can be said for the Tiga Vs. Dyna useless movie. Give it a go if you have it with the main package, but it's not something that will stick with you for very long TBH.
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