"The Observer" spotted during 'Idol', during the 'NFL' and in a scene on 'Fringe'.

FOX have started airing a new viral cross promotion campaign for J.J. Abrams’ sci-fi drama ‘Fringe’.

‘American Idol’ audiences were haunted by a mysterious bald man in a suit sitting among the audience during this week’s live performance show.

‘Fringe’ fans were quick to identify the mystery man as “The Observer” from the hit sci-fi show.

The character was never mentioned by anyone on the talent show, but instead remained seated eerily among the crowd.

This isn’t the first time “The Observer” has appeared on live television, the ‘Fringe’ character has been spotted during NFL and Yankees games; as well as during a NASCAR broadcast.

An ‘Idol’ clip has been posted on YouTube.