Nick Jr. Channel Schedule (3/31/2021)

How the Universe Works: "Mission to a Comet" (8:00 PM)

Space's Deepest Secrets: "Mystery of the Dead Planets" (season premiere) (9:00 PM)

Mysteries of the Unknown: "Underground Army, Death Ray and Space Trees" (7:00 PM)

Architects of Ancient Arabia (9:00 PM)