S4, E10: Appearing unexpectedly at Mystic Falls High, Rebekah (recurring guest star Claire Holt) wastes no time trying to force Stefan, Elena and Caroline to answer her questions about the search for a cure, leading to a bombshell piece of information from Elena. When Bonnie’s father, Rudy Hopkins (recurring guest star Rick Worthy – Supernatural), accepts the role of Interim Mayor, he makes it a priority to protect his daughter, who isn’t at all comfortable with the role he suddenly wants to play in her life. Professor Shane (recurring guest star David Alpay) continues to encourage Bonnie to believe in her powers, but he soon finds himself in danger when he reveals too much to the wrong person. Later, Caroline does her best to comfort Tyler after a violent confrontation. Meanwhile, at the lake house, Damon and Matt train Jeremy, trying to raise his game as a hunter, but Klaus is impatient with their progress and intervenes to speed up the process.