A strange spaceship crashes onto the island of South Ataria, throwing the world into disarray over its fate. Thus begin the Unification Wars, a worldwide war that eventually unites the planet under the governance of the United Nations. Now, a decade later, the reconstruction of the crashed alien craft – dubbed "Macross" – is complete. However, on the day of its christening, the Macross unexpectedly fires and destroys several approaching Zentradi spaceships. The last hope of Earth, the Macross, begins to wage a lonely war; but what hopes can one ship have when facing against an entire alien race?
In the early 21st century, insectoid organisms are invading the galaxy, searching for new stars to house their young. Mankind's only defense lies with space cadets such as Takaya Noriko, daughter of a celebrated admiral killed in battle, and Amano Kazumi, the top of her class. With their skill and the power of the mecha known as GunBuster, the girls must help fight to protect the galaxy from total annihilation...
After years apart, childhood friends Isamu Dyson and Guld Bowman reunite as rival pilots, each showcasing an experimental plane for the military. But their mutual love for longtime friend Myung threatens to spin their already tense feelings out of control! Now, each battles to secure Myung's affections, but even more dangerous than their own dark secrets is a clandestine plot involving superstar singer Sharon Apple that threatens all of humanity!
This part of Robotech is in based on the Macross universe. As such watching Macross Plus might appeal to you if you enjoyed Robotech, while if you enjoyed Macross Plus it might be fun to see a different interpetation of the Macross universe.
When Akito Tenkawa went looking for answers about his parents' deaths, he had no idea that he'd be indoctrinated into the spaceship Nadesico not only as a cook, but also as a mecha pilot – a job he wants nothing to do with! Alongside his childhood friend Yurika, stoic Ruri, otaku Gai and other misfit crewmates, Akito and the Nadesico crew find themselves in the middle of a brutal war against both the dreaded Jovian Lizards, and the military itself, who wants the civilian ship under their control...
Lowe Gear is a member of the Junk Guild, and made a stop to Earth for an auction. Amazed by a beam weapon made by ZAFT, Lowe bought the head of a BuCUE suit and discovered some top secret information! But danger lurks elsewhere in the Cosmic Era, not only to Lowe, but to Gai as well. As Gai helps Serpent Tail mercenaries to trap an antique model of a Ginn, he finds himself in pinch while meeting Ed The Ripper in the middle of space. How can the two of them play it safe while enemies continuously seek them to battle?
It's been a thousand years since the Gauna, a strange alien race with no known method of communication, destroyed the solar system. A portion of humanity managed to escape using enormous "seed ships" like the Sidonia, which have allowed them to maintain the population while drifting through space. Nagate Tanikaze is a young man who has been raised deep in the bowels of the ship. When he goes into training to pilot the huge robotic weapons known as Gardes, Nagate is entrusted with piloting the legendary unit known as Tsugumori. Nagate and his fellow pilots put their lives on the line against the Gauna, in the ultimate battle for the survival of humanity.
Both of these shows take place on a space colony, have to do with gathering resources and being attacked by an ancient alien race, and have mech fights. If you watch other shows in the "Macross" franchise, you'll be able to draw even more parallels in terms of setting and characterization, with the exception of "Macross 7," which is just silly fun.
The original "Macross" is a bit more drawn-out, dramatic; very much a classic space opera. "Sidonia" is very visceral and raw, an in-your-face type of show. Both are great, though, and well worth the watch if you're up for a similar set-up done very differently.