NBC renews 'This is Us' for three more seasons

NBC is picking up hit show "This is Us" for three more seasons.

(CNN)NBC has renewed "This is Us" for three more seasons, as part of a play-it-safe fall lineup that will add just three new series to the network's primetime roster.

The network will air 18 new episodes per season of the time-bending family drama, one of TV's top-rated shows. Although NBC called the move "unprecedented," the deal mirrors the pact that ABC made for "Lost" years ago, although in this case, network officials aren't definitively stating that the sixth season will be the program's last.