Monday night, the Passtronaut turned into a space cadet, and the improbably buoyant Vikings fell to Earth.
Joshua Dobbs, former aerospace engineering student, became one of the best stories in the NFL for a reason.
That reason: Improbability.
There was little logic in the story of a career backup who had made eight previous stops in the NFL, with seven different teams, becoming the Vikings' imported midseason savior.
Monday night, Dobbs' story was introduced to the laws of NFL gravity. In his fourth game for the Vikings, he threw four interceptions, leading to a second consecutive loss and a major blow to the Vikings' postseason hopes.
His fourth-quarter touchdown pass to T.J. Hockenson gave the Vikings a one-point lead that was erased by Cairo Santos' 30-yard field goal with 10 seconds remaining, giving the otherwise woeful Bears a 12-10 victory, their fourth of the season.
You could say the loss was costly, because Kirk Cousins and Justin Jefferson may have become much more expensive on Monday night.
NFL backups can give you a good game, maybe even a good month, but it is rare that they can replace a star-caliber player for any length of time once opposing defensive coordinators have identified their weaknesses and tendencies.