Nick Jr. Channel Schedule (4/21/2021)

How the Universe Works: "Curse of the White Dwarf" (8:00 PM)

Space's Deepest Secrets: "Bermuda Triangle of Space" (9:00 PM)

Mysteries of the Unknown: "Twin Trials, Heroine of War and American Stone" (7:00 PM)

Beyond the Unknown: "Glacier Inferno, Sea Serpent Cecil and Boogie Bomb" (9:00 PM)