'30 Rock' goes live in Thursday's episode

UNDATED (NBC) -- "30 Rock" is going live tonight.

The cast and crew said that last year's live episode worked so well, they want to try again.

Tonight's live episode will be made even more difficult by multiple flash-back scenes, which require quick costume changes.

The show will take place in Studio 8H, normally home to Saturday Night Live.

Two versions, one for the East Coast and another for the West will air.