Turtles of Grayskull is an American comic book limited series written by Tim Seeley, drawn by Freddie Williams II and colored by Andrew Dalhouse.
When the Teenage Mutant Ninja Turtles came across Krang and Shredder making a deal with some otherworldly 'demon-mage' named Skeletor, things got hella-weird and they ended up in ETERNIA!
[4] In early 2024, a crossover toy line was started as an offshoot of the Origin action figure series, which, following a longstanding tradition with the MOTU franchise, incorporated accompanying minicomics illustrated by Williams.
In order to prepare for the confrontation, the Eternians invite the Turtles to Eternos, where Donatello upgrades Man-At-Arms and Teela's weaponry with turtle-themed armor and Roboto with additional parts, turning him into Metal-Boto.
While Duncan and Donatello stay behind to finish their work on Roboto, Teela and the other Turtles follow Beast-Man, who leads them to a deserted arena, where - as expected - they run into an ambush set by their enemies, which includes He-Man, now a purple-skinned, raging berserker.
To find it, they descend to the Dwell of Souls in the lower bowels of the castle, where April summons the Spirit of Grayskull in the form of Splinter, the Turtles' adopted father.
Unbeknownst to them, however, Shredder has forged his own secret alliance with Hordak, Skeletor's former mentor; the two villains ambush Krang from the battlements of Grayskull and spray the heroic warriors with mutagen.
[10] The story begins with the Turtles contacting Splinter and April, who are still on Earth, through a dimensional window opened by Orko, telling them how they arrived on Eternia, only to find that the Shredder and Krang have joined forces with Skeletor[7] and are preparing a massive attack of their mutated troops on Castle Grayskull.
[11] He-Man and the Turtles easily defeat the All-Stars, but then the Prime Leader sics the Monstroid, on loan from the Evil Horde, on them, forcing them and Renet to flee the Triceraton Homeworld.
[13] After He-Man and the Turtles tell her how they ended up in the arena, Renet informs them of an anomaly where several timelines have tangled in a knot, triggered by the meeting between the mutants and the Eternians, and theorizes that in order to undo the mess, they have to prevent their teams' union from ever taking place.
For this purpose, Renet deposits He-Man in New York to prevent Skeletor from contacting Shredder and Krang, but there he encounters Bebop, Rocksteady and Casey Jones.
Renet, while merging with the knot to follow it back to its original cause, ends up in the garden of the Foot Clan's dojo in Japan, where she runs into the yet un-mutated Splinter.
[14] In Earth's past, Renet witnesses Hamato Yoshi and Oroku Saki discussing the admission of a new student named Sekiryou to the Foot Clan.