Of the four episodes celebrated by these posters, Season 2’s “Wrapped Up in Death” (originally aired on April 5, 2010) is by far the earliest in “Castle” history.
This would be the episode in which a museum researcher dies under mysterious circumstances — and it turns out that a curse might be to blame. Whoever looks at a mummy’s face is doomed to die. Castle (Nathan Fillion) of course does just that.
Next up is “The Blue Butterfly,” the Season 4 episode (aired Feb. 6, 2012) that transported the audience back to a film noir-style past. The story of an old murder was reenacted by the normal “Castle” characters, enabling the actual crime to be solved in the present day.
The third of the posters is for “Undead Again,” Season 4’s infamous zombie episode (from April 30, 2012).
No, no there weren’t any real zombies. The dead stayed that way as they usually do in “Castle.”
The final poster jumps into Season 5 with the comic-con episode, “The Final Frontier” (Nov. 5 2012).
They didn’t manage to sneak a “Firefly”-class ship in there, did they?
The 100th episode of “Castle,” “The Lives of Others,” airs on Monday, April 1 at 10pm on ABC.