It's been exactly forty years now that the Earth has been under threat from monsters and invaders. During a time when it seemed that everyone's smiles would be taken away, they came from the far distant Land of Light: those dependable heroes called "the Ultra Brothers". And now Ultra Father has sent one young champion to the Earth. His name is...
— Opening Narration
Ultraman Mebius is the 17th TV series and 40th anniversary production in the Ultra Series, broadcasted from April 8, 2006 to March 31, 2007.For the first time in 25 years, an Ultraman is sent to earth to protect it from aliens and monsters which would start to appear again. The Ultra Father entrusts the earth to their newest member, Ultraman Mebius. Under the guise of Mirai Hibino, Mebius joins the earth defense team GUYS in the Japan branch to better fend off threats to its people. What follows is an epic loveletter to the entire Ultra Series and capstone to the original Ultramen.
Ultraman Mebius provides examples of the following tropes:
Action Bomb: Ultraman Taro's "Ultra Dynamite" attack, which Mebius bases his own "Mebium Dynamite" attack on. (Taro's lifespan shortens a bit when he uses it — it's not clear if Mebius' does as well.)
Chekhov's Boomerang / Continuity Nod: Mebius is revived in one episode when Konomi deploys the Magnerium Medicalizer, the same weapon the Ultra Garrison used to revive Ultra Seven when he was crucified.
Cool Ship: Quite a few of the Super Prototypes GUYS has fall in this category.
Curb-Stomp Battle: The Emperor vs. pretty much everyone and anyone. He oneshots or curbstomps everyone.
Dangerous Forbidden Technique: All METEOR technology made available to GUYS is treated like this as it is reverse-engineered alien technology. To safeguard against its use, it can only be activated for one minute.
Elite Mooks: Imperizers. Made of IronDeterminators with a Healing Factor to make Wolverine blush — recovering even when being blasted apart into chunks. To stop it, they have to blow it into very TINY bits, or it will just recover. Even when they are mass produced, it takes the crew's most powerful attacks and no-nonsense tactics to take them down. Every time they show up is a guaranteed "Oh Crap" moment.
Failure Hero: GUYS subverts the usual human defense team and the whole series makes it a plot point that the Ultras are protecting humanity until they can fight together as equals.
Fallen Hero: For once, it's Zetton. Unlike previous series, this time it's one of candidate new capsule monsters to assist GUYS team. Unfortunately, its case got droped on floor and malfunction, turn Zetton to evil once more.
Mythology Gag: It's hard to go an episode without one, be it a returning monster or something else.
Oh Crap: Lots of times. Yapool, Mephilas, Imperizers and the Emperor all elicit this response at least once. Emperor takes the cake, as the merest act of landing on earth elicits this (and a whole bunch of explosions).
The Man Behind the Man: The Emperor is implied to have used most of the events in the series to his advantage to ensure his arrival.
Ragtag Bunch of Misfits: Lampshaded. Mirai brings them together because he saw them act bravely beforehand. How else can you get a Motorcycle ace, a Soccer Star, a Preschool Teacher and a Medical Student all on your team?
Mostly the movie, but also the last major story arc (starting near the midpoint of the series) so that for the final 4 episodes before the finale, the heroes teamed up with the previous Ultramen (and their actors).
And a literal version in the episode of the final arc that showcases Ultraman Eighty.
True Companions: GUYS crew, but especially important to the Ultramen as a whole who consider all of the people of earth part of their True Companions.
Villainous Breakdown: The Reflectian appears to be honorable alien at first. It's well mannered in its speech, always using honorific, and even spares Mebius after their first battle, claiming that he's too weak. After Mebius manage to damage its shield, it quick to use the GUYS crew as hostages.
What the Hell, Hero?: Given to Mebius by Ryu in the very first episode because he let the monster destroy buildings as he dodged the attacks.
Mephilas:Emperor! Have I become a useless piece in this game? Alas! (explodes)
You Have Out Lived Your Usefulness: Used by Yapool in the movie without so much as a word beforehand. Made all the more mean-spirited because the ally in question was in the middle of a Monologue about how he and Yapool would be teaming up.