Since I went through it, I figured I should at least write a synopsis for the wiki.
With it fresh in my memory, I wrote a first draft from memory. Now I'm double-checking.
And on my first check I find one of its cases of astoundingly shitty story-telling.
As I remembered it (or my mind made sense of it), when Tenchi first showed up to save Momo and Beni in the past and found them... these things happened:
He pressed his button,
the ground opened up to swallow the ship and his phone,
Momo and Beni get sucked into the dimensional rift and Tenchi is retrieved by Washu.
... and when they get back to the story 4 episodes later, that's basically how Washu explains it. Momo AND Beni got sucked into the rift and bounced around history... but that's not what happened. What actually happens is that Momo and Tenchi got sucked in (Tenchi popped back into Washu's lab). But Beni? She was still in the ship, and in fact, while the phone fell into a crevice... the ship did not.
I thought the worst bit of that section was that Ryoko and Mihoshi's appearance made no sense and was never followed up on.
Nope, the entire set-up of the story was fucked up.
I HAD succeeded in writing a synopsis that did not insult it... not sure if I can do it now.