Wednesday Change Up - SNL

Saturday Night Live - At the height of its early success, orginal cast member Chevy Chase headed off to pursue a film career was is replaced by adding Bill Murray who wasn't signed to the orginal cast due to budget constraints.

L to R: Garrett Morris, Jane Curtin, John Belushi, Laraine Newman, Dan Aykroyd, Gilda Radner, and Bill Murray.

The departure of Chase at the time sent a discord through the group, as well as NBC management. But as the years rolled on, the change of cast has become SNL's trade mark, a spring board for super stars.

The cast may have changed over and over again, as have the producers, directors and writers but the one thing that is still constant might surprise you. A key part in all 38 seasons and nearly all 740+ shows.

Any ideas who it might be?