Stardate: 46424.1 – While performing holodeck maintenance, Barclay accesses the stored hologram of Professor Moriarty, who wreaks havoc on board the Enterprise.

Stardate: 42286.3 Data and Geordi become involved with a holodeck program about Sherlock Holmes and his investigations, when they create Sherlock’s arch nemesis, Moriarty; however, modifications to the Moriarty character…

When Liz becomes the target of a mercenary known as the Debt Collector, Red turns to an unlikely source for help. Meanwhile, Ressler faces an unexpected complication in his efforts…

After discovering his criminal empire is under attack, Red turns to the task force for help, leading the team to hunt an assassin who kills her victims by infecting them…