one-off special featured an extra-long adventure starring
both He-Man and She-Ra called "The Third Sword".
Horde Prime finds out about the existence of an ancient
sword with equal power to He-Man and She-Ra's- except
this is evil power, as it is called the Sword of Evil.
The leader of the Elders cut it in half, and hid one
half on Eternia, the other on Etheria. Horde Prime summons
Hordak and Skeletor and sends Skeletor to Etheria and
Hordak to Eternia.
On Etheria, Light Hope summons She-Ra and tells her
of the Sword of Evil, and reveals one half locked in
a room in the Crystal Castle. He tells her to take it
to the Cosmic Well and throw it in. The Cosmic Well
is atop an undersea mountain, so Frosta freezes the
water and She-Ra blasts an undersea tunnel and slides
down to reach the well. But she is attacked by Skeletor,
who escapes with the sword and delivers it to Horde
She-Ra instantly contacts He-Man, and The Sorceress
reveals the other half of the sword in a locked room
in Grayskull. Ancient books say the sword should be
thrown into the Pit of Light should the forces of evil
ever look for it, but the Pit of Light is within Snake
Mountain! He-Man makes his way to the evil lair, but
is attacked by Hordak, who takes the sword and delivers
it to Horde Prime. He-Man and She-Ra quickly journey
to Horde Prime's base, and after a struggle, destroy
the sword before Horde Prime can join its two halves.
(It was not often that we saw He-Man and She-Ra together
in the comics, so this is essential for any collection.
Also has a very good storyline, with lots of action
and a great scheme by Horde Prime.)