Splinter-Skull is a character appearing in the Turtles of Grayskull (mini-comics). He is both Splinter and the Spirit of Grayskull, merged into one form.
Turtles of Grayskull[]
Sent there by Sorceress, the Turtles, April O'Neil and Casey Jones reach the Dwell of Souls. April apologizes for not knowing what to do because having powers is new to her. The Turtles take seats around the blue fire pit at the center of the room. Leonardo says that Master Splinter always tells them to meditate and the answers will come to them. April dutifully closes her eyes. A moment later the guys call out to her because she is flying and the blue flame is all around her. April freaks out, overwhelmed by her new power, so Raphael leaps up to grab her. Both receive a shock that knocks them to the ground. April wants to know what happened and a familiar voice calls out that he believes he is what happened. The group looks up to see Splinter, decked out in flowing robes, floating above them. They are confused and April says it’s the Spirit of Grayskull but also Splinter. Raph wonders if they are supposed to call him Splinter-Skull. Splinter tells them that the Sword of Power calls through him and is hiding from its master, He-Man, fearful that it will be found by greater evil. Splinter says they must recover it first. Leo asks where it is and Splinter-Skull says it is on the Forgotten Island. The Turtles travel there and locate the sword, but are also confronted by Skeletor and the mutated He-Man. Both He-Man and Leo race to reach the sword and end up touching it simultaneously. There is an explosion, and the Turtles and He-Man are blasted back to the Dwell of Souls. Splinter-Skull presses his hands to Leo and He-Man's chests, evokes the Power of Grayskull, and brings them back to consciousness. The Spirit of Gray-Shell