If you thought that season two was bad, then turn around and don't watch these Ovas. Because they're much worse.
Story: They literally jumped from zero to a hundred with no explanations. These Ovas start with the main characters hunting down Terra Formars on earth (we have no idea how did they get back from mars and how Terra Formars reached earth) then they introduce a new strong character who joined the main characters to kill Terra Formars. So, there were a lot a lot of fighting between Terra Formars and the main characters. Just llke S1 & S2, no real story just fighting. Then
they introduced the Terra Formars' leader who wears like Buddha holding a human baby and on his sides two "bad" humans (his alliance). So, how did he manages to make friends with humans? Who is that baby?? I have no idea. So, as expected, there was a big fight between his followers (Terra Formars) and the mean characters. The main characters kinda won the fight . After that, Buddha (or whatever you wanna call him) run away with the baby, and the main characters kinda had a happy moment and start laughing and that was the end. Basically, a complete shit.
Art: Aiming for children.
Characters: More retarded than they were in season two.
Overall: Don't waste your time on this shit.
(personally I had so much expectations from this Anime, but they ruined it with their lack of a story and too much fighting, and they added many fan services, which is cringe in this type of Animes. Also, they made the Asian group the bad ones (except for Japan of course because they're the good ones a long side with the west) which is kinda racist. And that totally ruined it for me. It was really unnecessary.