See Also: Notable Characters Season 1 | Notable Characters Season 2 | Notable Characters Season 3 | Notable Characters Season 4 | Notable Characters Season 5 | Notable Characters Season 6 | Notable Characters Season 7 | Notable Characters Season 8
- Senator William Bracken turns out to be connected in some way to Johanna Beckett's murder, but Kate doesn't have enough evidence to arrest him for it.
- Kristina Coterra - Entertainment reporter who's known for interviewing subjects while in her bikini.
- Vincent "Vinny the Scar" Cardano, cousin to Sal Tenor from A Death in the Family, turns out to be a neighbor of the victim. Castle invites him over for some linguine and a bottle of red, but offends him by hinting that Vinny might know something about the crime.
- Gabriel Winters, a cocky actor from a long-gone sci-fi TV show, trading on his past fame for current, um, favors from lady fans.
- Benjamin Donnelly, crafter and purveyor of realistic futuristic gadgets and weapons, including one that turns out to work all too well.
- Stephanie Frye, an actor who spent years distancing herself from the TV show, only to find she might get sucked back into the fandom.
The Lives of Others - 100th episode in the series