I'm really excited for this crossover but the plot raises a few questions.
1. who do the Gokaigers know about the whale gun. It's related to the zyumans and there no real way they should know about them either.
2. Who would the deathgaliens know about past sentai villains.
3. how are there new ranger keys. Because none of the last few sentai lost there powers (except toqger but they just gave there's back to the rainbow line). In fact it's still never been explained how they even have ranger keys after they gave them back at the end of there series .
Still excited but these are just thing I'm curious how these things will work out.
One more thing. Of all the Gokai changes why are only two of them from anniversary series. The animal one I understand (even if they should be using gosei blue instead of red) but I dont get the other one.

but Zed ain't dead

move over Ninninger, the Zyuohgers are teaming up with a team from a GOOD series

But Zett didn't even die

It could be they use Bangrays memory power. Except that raises the question of whose memories he used. The best choice would be marvellous but he only encountered dokoku (hero taisen), brajira (199 heroes) & enter/escape (go busters vs). Deboth and zett however.

So with the ranger keys in the picture does that mean there only doing one change per season instead of having them use all four team changes and why no villain from ninninger. Just use kibaoni gengetsu. Would make more sense than ones from shinkenger and goseiger. And why two from go busters

Why Zed? Where's Gengetsu Kibaoni?

In response to the people confused about Zett's inclusion in this event consider this its very likely that these past villains are being revived/recreated by Bungly's power. If that is the case we don't have any evidence yet that proves he can only create duplicates of dead people but rather that he creates duplicates based on peoples memories. If this is the case then the Deathgaliens might be amplifying his powers in some way to allow him to create duplicates of powerful villains that the people of earth have memories of. It's a stretch I know but its all I've got. As for the question of how the Gokaiger's still have ranger keys thats an easier one to answer, in the Go-Busters vs Gokaiger movie it was heavily implied that Gai went to the previous sentai and just asked to borrow their powers again I' mean its not like the Jetmen or the Gorangers are using them anyway.

Two of my favorite sentai teaming up! Ninninger please step aside, you are ruining the hype

Yes the same can be said of the recent Sentai as well. Their powers were borrowed and converted into Ranger Keys. Either that or the second greatest treasure in the universe that they found enabled them to wish for copies of the Ranger Keys for any and all teams that precede or succeed them.

If Gokaiger team up with Ultraman Orb, it will have they chance to help him take down Jugglus Juggler.

If Gokaigers team up with Ultraman Orb, Gokaigers will have a chance to take down Planet Invasion Union of Alien Mefilas Nostra, Alien Nackle Nagus & Alien Metron Tarude from invading planet Earth.

Wishful thinking, but if there are keys for Go-Busters (not the Buddyroids), Kyoryuger, ToQger, and Ninninger, I'd really love to see the Greater Powers for those. Especially if it means a new Gokai-Oh.

Could this mean an updated mobirate

Let me throw in my hat in this discussion.

1. Remember, the universe of Super Sentai unified now (hmmm...I forgot the Kamen Riders and the Space Sheriffs as well, but let's focus on the Sentai teams) so who knows what the Gokaigers were doing, they are adventurers so catching wind about another treasure on Earth, the Whale Charge Gun, is not surprising at all.
2. About the Ranger keys, the past Sentai teams acknowledged the Gokaigers, so if borrowing their powers again means to protect the Earth from the bad guys, they would lend it to them in a heartbeat.
3. About the past Sentai villains, Bang Ray has the power to copy memories as seen in the show. I'm thinking the Gokaigers could have encountered Bang Ray somewhere in the universe before and copied their memories, although Deboth and Zett are a stretch here. Unless, Bang Ray also encountered the Kyoryugers and the ToQgers in the past as well.

I don't mind them not answering why they have the new ranger keys cause A) it's a tv show and B) I didn't think they did a good job explaining where the original keys came from. Or the gokaiger powers in general.

One of my biggest pet peeves about sentai, and one of the few areas I think power rangers does a bit better, is explaining where the powers come from and how they work. Just look at Zyuohger. Who made the champion cubes? Why do they have ranger powers? We know they're connected to each animal from Larry giving his life energy for zyuoh gorilla but not much else. Same with ninninger. We learn some boy in the mountains made the mechs but even that doesn't get explained well. How come he's able to make a nin for starninger with a soul but not with the gekiatsu?

At least power rangers in most season give some sort of explanation even if it's weak ones. Well except super megaforce "there's a good explanation for that". That appears to be more exception than rule. That season was a mess.

Well to address your pet peeve there Anon, the Ranger Keys came from the 34 Sentai giving up their powers to defeat the first invasion of Zangyack. The powers were transformed into Ranger Keys (now that isn't explained why the powers took the form of Keys) more for promoting the toys perhaps...

Is it me or does bang ray look more zangyack than death galleon

What the hell why gokaiger not ninninger.I'll prefer if zyuohger vs ninninger team up like how gokaiger and goseiger team up

I'd prefer if zyuohger team up with ninninger like how they did in gokaiger and goseiger. I want to see the future sentai in that team up

Look like Bangray has the rangers fight a giant Akudos Gills, so that takes care of the Gokaiger's villian. Still no Ninninger villian in this anniversary episode(s) though.