"The Blacklist" Season 1 Episode 18 aired on Monday, Mar. 31.

The cold open begins with a suicide taxi driver killing himself and his passenger in a car crash. Next, a horribly scarred man makes a wire transfer, strips, makes himself a smoothie, removes his prosthetic nose, and turns on a UV light positioned over his recliner. This man is Milton Bobbit, aka The Undertaker. He is the next name on Red's blacklist.

Lizzie's husband, Tom, is still playing house—making pancakes and asking her to renew their wedding vows. Elizabeth asks Red to tell her everything he knows about her husband. Red says he has been trailing Tom for years, but claims he doesn't know much more than she does. He still refuses to tell Lizzie what his connection to her is. Using his trademark diversion/redirection technique, he reveals that The Undertaker is famous in the underworld for convincing ordinary people to kill strangers, often through murder-suicide. It is unclear how The Undertaker targets and persuades the perpetrators and victims.

Still trying to figure out who her husband is, Elizabeth plans a surprise wedding vow renewal ceremony, and invites Tom's "brother." She lifts the brother's DNA and finds out, not surprisingly, that he's not who he says he is. Lizzie surprises the brother, Christopher, in his hotel, and after cuffing him to the bathroom sink, turns him over to Red and his bodyguard/friend, Dembe. They find out that Tom has a real brother who lives in Chicago, and not much else. Red and Elizabeth overhear Tom mention the city of Berlin to Christopher. When questioned regarding who or what is in Berlin, Christopher throws himself out of his apartment window.

Meanwhile, the FBI finally finds out who Milton Bobbit is: An insurance actuary who was Patient Zero in a shady diabetes clinical trial. After becoming terminally ill from the drugs they gave him, he became obsessed with death. The seemingly random murder-suicides he commissions are actually terminally ill individuals who kill those involved in the diabetes study in exchange for millions of dollars being transferred to their families. Agent Ressler arrests the doctor responsible for the trial in front of a bomb-strapped Milton, who then commits suicide.

"The Blacklist" airs Mondays at 10 p.m. EST. on NBC. The show is taking a two week break; the next episode will air April 21st.