NBC flipped two shows in its prime-time lineup, with the network issuing an announcement that “Running Wild with Bear Grylls” will now lead off prime time on Mondays at 8 p.m. (7 p.m. Central), followed by “American Ninja Warrior” at 9 p.m. (8 p.m. Central).

The network did not offer an explanation, but released episode information for the next two weeks. The episode of “Bear Grylls” scheduled for next Monday, June 11, will feature Zac Efron, and will be followed by a repeat of the “American Ninja Warrior” All-Stars Special.

On Monday, June 18, “Bear Grylls” will feature Don Cheadle, with the show to be followed by an original “Ninja” episode, “Indianapolis City Qualifiers.”

Details on all of the above episodes can be found by clicking here.