Star Trek Discovery S4 Ep6 review (Spoilers) Prime Directive

Seeking answers, the USS Discovery ventures into a subspace rift created by the Dark Matter Anomaly. Meanwhile, Book faces a strange visitor from his past. Johnathan Frakes comes in to try and save the day but isn't as successful as we'd hoped.

Cast
Sonequa Martin-Green as Michael Burnham
Doug Jones as Saru
Anthony Rapp as Paul Stamets
Wilson Cruz as Hugh Culber
Blu del Barrio as Adira Tal
David Ajala as Cleveland Booker
Annabelle Wallis as Zora
Ian Alexander as Gray Tal
Rothaford Gray as Tareckx
Emily Coutts as Lt. Cmdr. Keyla Detmer
Patrick Kwok-Choon as Lt. Cmdr. Gen Rhys
Oyin Oladejo as Lt. Cmdr. Joann Owosekun
Ronnie Rowe Jr. as Lt. Cmdr. R.A. Bryce
Sara Mitich as Lt. Cmdr. Nilsson
Raven Dauda as Cmdr. Tracy Pollard, MD
Ivan Lopez as Ens. Cortez
Avaah Blackwell as Osnullus bridge officer
Jayne Dineo as Discovery sciences crewmember
J. Adam Huggins as Discovery engineer
Leeu as Grudge