Mr. Mobius was senior executive in middle management of the Time Variance Authority. He was genetically engineered like many others of the executives and agents of the authority. He rose through the ranks due to his perseverance and love of details. His job is to keep track of the various timelines and determine their fate if needed. Mobius is loosely based on Mark Gruenwald.
Mobius was first seen when the Fantastic Four (Human Torch, Invisible Woman, Mr. Fantastic, Ms. Marvel/Sharon Ventura, Thing) were arrested for repeatedly interfering with the timelines through time-travel. Doctor Doom was supposed to be arrested with them but manage to fake his death and hide. Mr. Fantastic tried to defend his team by pointing their actions were similar to those of the Avengers and the X-Men who had not be arrested. This only led to Mobius looking into these files as well and starting to plan to discontinue their timeline.
Before he was able to pass any judgement, Sharon started flirting with him. Trying to impress her, Mobius led the Fantastic Four to a tour of their offices. This gave them the time and information needed to escape. Thanks to some sabotage their timeline vanished from the records of the Authority, making it temporarily undetectable. Mobius later did relocate it but chose to let it be.