Riker is sent on a mission to find the starship he once served on, and discovers a secret which threatens to compromise the peace treaty between the Federation and the Romulans. Sci-fi drama, starring Patrick Stewart and Jonathan Frakes

A lieutenant is found murdered in his quarters, revealing a possible connection to a disturbing dream experienced by Ezri in which she encountered one of Dax's previous hosts. Sci-fi drama, starring Nicole de Boer and Avery Brooks

After O'Neill and the team help relocate displaced aliens to a new homeworld, another civilisation tries to colonise the same planet, leaving the team striving to discover a fair solution to the dilemma. Sci-fi drama, starring Richard Dean Anderson and Amanda Tapping

Monroe investigates a robbery at a church and notes some suspicious activity among its flock. The preacher asks for his help, and it soon emerges that the congregation are all Wesen creatures. David Giuntoli stars

A Wesen puts a contract out on Monroe, but the individual approached for the job turns out to be his ex-girlfriend Angelina. Instead of accepting the $25,000 on offer, she unites with Nick to help her former partner avoid his fate. Silas Weir Mitchell stars

The destruction of his wife and stepson prompts Hershel to tell the others he wants them off his land once and for all - and then he promptly disappears, raising concerns that he will start drinking again after years of sobriety. As the survivors bury Sophia, Carol refuses to acknowledge the funeral and falls into a deep depression, while Shane and Rick's differences openly erupt. Andrew Lincoln, Scott Wilson, Jon Bernthal and Sarah Wayne Callies star