I don't know if I can do justice to this idea in full, but...

******

"But, Mommy, why?"

"Someday, my daughter, you will rule Crystal Tokyo.  In order to rule
with compassion, you must know how your people live.  Even today, few
of us are capable of magic.  Besides, there are many situations where
magic would be counterproductive.  Sailor Moon could not solve all my
problems; there were some that only Usagi could handle.  That is why, on
this trip, you must promise me not to use your powers except in extreme
emergencies."

Chibi-Usa sighed.  "Ok, I promise.  Will Puu send me back to you?"

"Not this time.  You will be heading for the mid-21st century: a time
when the world's magic was waning, to the point that the Freeze was our
only hope when magical enemies showed up a few decades later.  You did
visit me, and I watched over you, but your adventures were your own this
time.  Tokyo, and the world, was in need of the hero you became."

"Really?  Sailor Chibi-Moon-"

"You were not known by that name," Serenity quickly interrupted.  "There
was no public connection between us, other than friendship."

"Then, what was my name?"

"A very appropriate one."  Serenity smiled.

******

A blaring alarm shattered her reveire.  The past was the past, but it
had been so many years since she had seen Crystal Tokyo.

And now, her homesickness was about to end.  She fingered the Time Key
around her neck.  Knowing that this was a suicide mission made her last
act in this life so much more easier.  In the end, only the blasted
remnants of her hardsuit would be found, in a crater that currently
held the entire senior management of GENOM.  Everyone would think that
she had been incinerated with them, when in fact, she would just
teleport home right before the blast.

It hurt to know that her colleagues did not know this...or could ever.
But, they had to think that she was dead if this was to work.

She had turned off her hardsuit's intercom's speakers, so she would not
have to hear Mackie's pleas for her return.  Priss and Linna had not
spoken; one was having trouble believing what was happening, and the
other was busy trying to intercept her friend in the Knight Wing.  Linna
had not expected her friend to jump with a bomb strapped on...but then,
she had not known why they were doing an overflight of GENOM Tower in
the first place.

And Sylia...poor Sylia.  The girl knew that Sylia's body would recover
from what the boomers had done to her.  The one who was, and soon would
again be, Chibi-Usa had been willing to take orders and play along right
up until GENOM started trying to assassinate the Knight Sabers directly.

She would have liked to have thanked the one who gave her that
information.  But then, the blackmail artist was herself blackmailed by
one whom she never knew in this lifetime, and the girl wished to keep it
the way.  What was her name...Nabiki?  Appropriate that she had found
employment at GENOM.  She was just low enough not to have been invited
to the executive meeting...and, consequently, in a good position to
become the new corporate head after all of her superiors vanished in a
fireball.

Nene shook her head as the tower approached.  Unknown to her, her
hardsuit's speakers were still on.

Mackie would never understand the last words he heard from Nene.

"MOON PRISM POWER, MAKE UP!"

******

The entries responsible for this:

If a character from BGC really ends up to be someone from another
series: One drink per character.

...and...

If a character from another series joins Genom's side: Three drinks
and congratulate the author on originality.