Lord Marcus Sandelhein (sometimes spelled Sandelheim) aka Lord Simultaneous is the lord and master of all time and space.
A methodical and dedicated Time Lord, committed to keeping the time stream of Earth clean and unpolluted. He has trained several apprentices over the years and had found life with his latest apprentice, Renet, to be by far the most difficult. Prior to taking on Renet, Savanti Romero was his apprentice, who ultimately turned on him and tried to "edit" him out, forcing him and the 79th Level to banish him to 1406 A.D. He did, however, have high hopes for Renet, since he saw something of his own youthful rebellion in her.
Marcus' own Time Lord tutor was Lord Marcellus Timagetus. Marcellus, who found and conquered the 79th Level from his origins in the Roman Republic (circa 180 B.C.), rescued the orphan Simultaneous from a particularly violent siege during the Middle Ages. Marcellus found the young Simultaneous to be disobedient, rude, and far too bright for his own good, knowing talent when he saw it. He spent some time experimenting with the creation of magic-manipulating micro-chips, hoping to develop ways of assembling power objects from digital/magical components (Transdimensional TMNT).
Against his wishes, Renet once time-traveled off with Lord Simultaneous’ Sceptre of the Sands of Time to modern-day New York. Fleeing Simultaneous further, she and the Turtles went to 1406, where they teamed with Cerebus to get the Sceptre back from Savanti Romero, who was bent on stealing it for himself. Simultaneous appeared and cast Savanti into prehistoric times (TMNT Vol. 1, #8).
The comics he has appeared in include but are not limited to:
- 1986 January 1 Teenage Mutant Ninja Turtles (Mirage Comics) issue 8
- 1989 January 1 Teenage Mutant Ninja Turtles Graphic Novel book 3 issue 3
- 1990 June 1 Teenage Mutant Ninja Turtles (Mirage Comics) issue 33 Turtles Take Time
2003 TV Series
Simultaneous later took on another apprentice, Renet, who accidentally disrupted the evolution on a planet and he grounds her, putting her on dusting, which she hates. Figuring that she could use the Scepter to have some fun and return to finish, she grabs it only to trigger an alarm. Hoping to find some place to hide, she ask the Scepter to take her to where the Turtles are, seeing them having fun in the Orb of Hindsight. Simultaneous tracked her to their time but she managed to escape with the Turtles to the 15th century.
In the face of danger from Ultimate Drako, a fusion of the Ultimate Ninja and Drako, she calls Simultaneous for help, freezing the fusion in time. He then sends Savanti into the Cretaceous period. But before he can decide Ultimate Drako's fate, they break free of his hold, having gained power to free themselves and snatch the Time Scepter from his hand and disappears. But Simultaneous isn't worried, as the Scepter has a mind of its own. He then further imposes six, then seven more weeks of dusting and then sends the Turtles back to their time.
In "The Real World, Part 2", Simultaneous appears again at the Battle Nexus after the Turtles and Splinter defeated Ultimate Drako. He explains to them what just happened. The Time Scepter read everyone's thoughts, weighed good against evil and set everything right with help from the War Staff.
Noting the dusty remains of the now separated Ultimate Ninja and Drako and the grieving Ultimate Daimyo, Simultaneous decided to give the Ultimate Ninja a second chance for sparing his father, resurrecting him as a child, thinking that his previous life was all a nightmare. He then sent the Turtles, Splinter and Miyamoto Usagi back to their home dimensions.
As lord of time and space, Simultaneous had control over such powers. The Time Scepter helps him with his powers, such as freezing individuals. He can also transport independently across time and space, including different dimensions and realities.