Teenage heroes from the past, present or future – real or imagined – have come into possession of an object – an Game Artifact – that allows them to travel through time and space, but does not allow them to control where in time or space they go.
When we capitalize “Artifact” without any other identifier, we mean the Game Artifact.
The Artifact identifies them as a contestant in The Game, organized by unseen Producers. In order to continue to use the artifact, the holder of the artifact must play the game. Otherwise the Artifact stops working and/or disappears into the possession of someone more willing to play.
Once the challenge is completed, the Artifact will whisk the cast away to another point in space and time, where yet another challenge awaits them.