Only you would know ;)

Continuing from where 18 left off, Exia starts wailing on Throne Zwei, leaving the two other siblings to gawk at this turn of events.

Johann plays the "We're allies!" card, but Setsuna sticks to his ideals and yells out that the Trinity siblings and their suits aren't Gundams.  With that out now, Johann gives Michael the order to engage.

Some flashy combat ensues, followed by the entrance of Virtue, followed by a shift back to space, where Sumeragi-chan pretty much lets everyone do what they want.  After Lockon's chat with Haro about Setsuna's unhealthy obsession with Gundams, we get another scene switch to the hawt mainlander.

So now we know she's willing to do anything to change the world (why didn't you tell this to us sooner then?) 

Back above the sea, Virtue and Exia continue combat with the Thrones, even using tactical formations.  Johann tells Nena to dock with him (oh u, so subtle), but Tieria interrupts.  The two siblings dodge and point their weapons at Virtue, Virtue smoothly following up by unleashing Nadleeh.

Once Tieria acquires his Helm of the Dominator, he calls the siblings not worthy of being Gundam Meisters, and prepares to take out Throne Eins first with a beam saber.  Sadly, his Trial period expired after only a minute of use, giving Throne Eins enough time to evade.

Now Dynames comes in, making it a 3 on 3…except…it's not really a 3 on 3 anymore, it's Johann VS. Lockon.  Johann reveals Lockon's real name, telling him that he lost his family because of Setsuna, revealing Setsuna's real name as well.  Leaving the shock of information to do its job, the Thrones fall back.

Back in the cities, it seems someone has informed the leaders that the Gundams are fighting amongst themselves.  At the hospital, Saji's still emo over how Louise can't give him a proper handjob anymore lost her left hand, and we get a flashback of all the times he was dominated by her.

Once Saji leaves the place to return home, his sister continues her ambition to track down just what Aoelia Schenberg's true motive is.

Now back on the island they always launch out of, Lockon's past, as well as some more of Setsuna's, is revealed.  After this wealth of information exchange, the two make up to each other, with Tieria finally feeling like a human.

And on the Thrones' side, apparently they never thought they'd get attacked by the other Gundams, so now they await further directions from Lagna.

Antarctica…representatives from each of the 3 major factions are shown 30 Tau generators…

Impressions:
Really great episode, good fighting, plot's heating up, well-timed character development, and even more to come in the following weeks.