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For almost a full season, the plucky folks who help those in need have defeated Monster of the Week after Monster of the Week, protected the space-time continuum from invading aliens, stopped an Antimatter explosion from removing North America from the face of the planet, and saved the President.

Now, however, they are vexed by someone who seems to know their strengths, their weaknesses, and everything in between. They're outmaneuvered, outnumbered, and outsmarted. The season ends with the villain gloating over them, saying their most dangerous tasks up to that point have simply been tests he has engineered.

The Arc Welder cometh.

Arc Welding is a retroactive form of Continuity Creep that occurs when a series which has heretofore been episodic retcons itself so that it's all linked in a Story Arc. The most common approach to Arc Welding is probably when one antagonist, hidden up to that point, is responsible for all the major threats the protagonists have faced thus far.

Alternatively, several arcs might be revealed to part of a larger Myth Arc. This is rarer, possibly because it's harder to do well and shows that would benefit from it might not last long enough to play out the retcon.

Arc welding is different from Story Arc or Myth Arc because it is always retroactive. Series that start out with a Story Arc or Myth Arc already in place generally aren't welded. If something were already part of an arc, it wouldn't need welding.

The creators may be simply putting unrelated crap together for the sake of using up the budget now that they're renewed. It can be also be a stroke of brilliance, the creators now realizing an underlying theme of their work on the series thus far. Lastly, Arc Welding itself can be plotted from the beginning, as The Reveal.

Compare The Moorcock Effect, which ties together different series, and Midnight On The Firing Line, which retroactively ties a seemingly unrelated event into an existing Story Arc. See also Meta Origin.

Examples

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