Nathan Fillion: "For a number of years I kept expanding a costume I made of a nine foot tall Grim Reaper with mechanical hands and eyes that lit up with a button. I was just about to add a big set of bat wings that would open up when I realized I was getting a little older and if I ever fell down while on these stilts I would probably never get up." Stana Katic: "I was Pippy Longstocking, who I loved from childhood."
Leave it to Nathan to have something adorably complicated and Stana to keep it no-nonsense. Check out what some other TV stars said here.