Perlmutter determines that Annabelle died from a high-intensity laser beam through the chest. Castle believes “laser” means “phaser” before launching into his best Captain Kirk voice impression. A witness saw Annabelle walk into the ship with Stephanie Frye (guest star Christina Moore), who played Lieutenant Chloe on the original series. She has since gone on to make it big in the movies. She had no interest in getting involved in her old show’s fan experience like Gabriel Winters, who happens to have a working laser blaster as part of his space outfit. Speaking of outfits, Castle freaks when he catches Alexis in a skimpy space costume at the convention.

Gabriel Winters alibis out for the murder, but claims Annabelle had a boyfriend. Ryan and Esposito check out a sci-fi party where Annabelle was seen with a Creaver, which is one of the nasty evil aliens from Nebula-9. As for the laser gun, Castle and Beckett track down its maker, Benjamin Donnelly (guest star Armin Shimerman), who has a really cool laser-filled lab. The guy is a purveyor of sci-fi hardware for the discriminating enthusiast. Castle shows interest in his double-bladed light saber, but Beckett would much rather see the plasma pistol that matches the murder weapon. He sold one to someone dressed in a Creaver costume.

The team tracks down Simon Westport (guest star Chris McKenna) who bought the live-fire laser weapon for Annabelle as a gift. They had a “same time next year” relationship whenever SuperNovaCon rolled around. Simon says she was upset after a having confrontation with her pal Davis, who semi-alibis out. Davis also mentions that Audrey gets all the rights to Nebula-9 now that Annabelle is dead. She just sold them for $2.5 million. Of course, Audrey denies killing her best friend.