CBS | 8:00 pm

Mac (Lucas Till) and his team are challenged with the makings of a classic whodunit — or in this case, a how’d-he-do-it — as they wrestle with a puzzling locked-door scenario, wherein a man who is working inside a remote, ultra-secure seed vault inexplicably disappears in the new episode "Seeds + Permafrost + Feather." Tate Donovan guest stars in his recurring role as Oversight; Carsten Norgaard also guest stars.