The Time Baby is a giant, time-manipulating babylike creature, as well as the tyrannical supreme ruler of the future.
The Time Baby is "the last son of an extinct race of time giants," and weighs approximately 9 trillion tons. At some unknown point in the past, the Time Baby was frozen in an Antarctic glacier. According to the Northwest Cover-up, the statues at Mt. Rushmore are actually robots to be called into action to fight the infant upon his release. At some point in the distant future, he is freed due to global warming and wreaks havoc on human civilization, ultimately overpowering all opposition and ascending to global domination.
After Dipper and Mabel Pines compromise Time Anomaly Removal Crew agent Blendin Blandin's mission in Gravity Falls, Oregon in "The Time Traveler's Pig," the Time Baby blames the operative for the incident, sends him to remove them, and then sentences him to "10 squared" lifetimes in the Infinetentiary. When Blendin escapes and invokes Globnar against the Pines twins in "Blendin's Game, the Time Baby presides over the match and carries out the twins' requests when they win the battle, as well as providing them with a time wish.