Dimension X-103 is Hekapoo's home dimension and the place where dimensional scissors are forged. It has a time flow different from that of the Earth (and most other dimensions), where eight minutes on Earth are equivalent to sixteen years.
X-103 consists mainly of barren and arid lands. It has decayed vegetation and large crags and volcanoes.
The main location is Hekapoo's forge where the dimensional scissors are manufactured.
Other regions of the dimension include the Afflicted Forest, a forest with perpetual lightning in the treetops, and the Neverzone, a snowy region inhabited by wraith-like creatures.
In "Running with Scissors", Marco is pulled into X-103 by Hekapoo, who had discovered he had been abusing the scissors Star lent him, which were actually Hekapoo's scissors. In order to get the scissors back, Marco agrees to win them by blowing out the flame on Hekapoo's head, which she makes nearly impossible by creating hundreds of clones of herself. However, Marco spends the next sixteen years hunting down Hekapoo's clones until he finally finds the original and earns his own pair of scissors. When Star arrives, revealing that only eight minutes have passed since his departure from Earth, Marco decides to return with her, though Hekapoo reminds him that he can return whenever he wants with his new scissors.
In "Night Life", Marco and Hekapoo travel through X-103 looking for one of the portals that Star had been unknowingly opening for the last few days. There, it is revealed that Marco resumes his adult form when he enters Hekapoo's dimension.
In "Ransomgram", Marco is forced to return to X-103 (with Star tagging along) when his Dragoncycle Nachos is held for ransom by the Wraiths of the Neverzone, who demand that Marco return their sword (which Marco named "El Choppo") in exchange for her. Once they arrive in the dimension, Marco summons Brunzetta, an old friend of his, for help. After arriving at the Neverzone, Marco learns that the sword was preventing a fire demon from attacking the Wraiths' castle, and now that it is gone, the demon is causing massive destruction. Struck with guilt over his unknowing actions, Marco returns the sword, and stays in X-103 long enough to repair the damage to the Wraiths' castle.
In "The Knight Shift", Marco opens a portal to the Neverzone, allowing several knights of Mewni to train there. Higgs briefly returns, but, disappointed that she's lost the muscles she gained, decides to go back and stay in the Neverzone.
In "Gone Baby Gone", Meteora and Marco's baby sister Mariposa wander into the Neverzone after Hekapoo accidentally leaves one of her portals open. There, they grow to be teenagers by the name of "Grobb" and "Bork" respectively before returning to Earth and reverting to infancy.
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