- Ep: 31
- Episode 1
- Cast: Ciarán McMenamin (Matt Anderson), Andrew-Lee Potts (Connor Temple), Hannah Spearritt (Abby Maitland), Ben Miller (James Lester), Alexander Siddig (Philip Burton), Ben Mansfield (Captain Becker), Ruth Kearney (Jess Parker), Janice Byrne (April Leonard), Lucy Vigne Welsh (Miss Reece), Patrick Murray (Anthony)
- Written By: Chris Lang
- Directed By: Mark Everest
- Ep: 32
- Episode 2
- Cast: Ciarán McMenamin (Matt Anderson), Andrew-Lee Potts (Connor Temple), Hannah Spearritt (Abby Maitland), Ben Miller (James Lester), Ruth Kearney (Jess Parker), Bosco Hogan (Admiral Marston), Allen Leech (Officer Sam Leonard), Tom O'Súilleabháin (Captain Marcus Yates), Sam Peter Corry (Submariner)
- Written By: Steve Bailie
- Directed By: Robert Quinn
- Ep: 33
- Episode 3
- Cast: Ciarán McMenamin (Matt Anderson), Andrew-Lee Potts (Connor Temple), Hannah Spearritt (Abby Maitland), Ben Mansfield (Captain Becker), Ruth Kearney (Jess Parker), Ruth Bradley (Emily Merchant), Stephen Hogan (Lord Henry Merchant), Janice Byrne (April Leonard), Tom Maguire (Dr. Webster), Phil Deguara (Local Man), John Paul De Jonge (Puppeteer)
- Written By: Paul Mousley & Gabbie Asher
- Directed By: Robert Quinn
- Ep: 34
- Episode 4
- Cast: Ciarán McMenamin (Matt Anderson), Andrew-Lee Potts (Connor Temple), Hannah Spearritt (Abby Maitland), Alexander Siddig (Philip Burton), Ben Mansfield (Captain Becker), Ruth Kearney (Jess Parker), Ruth Bradley (Emily Merchant), Janice Byrne (April Leonard), Juliet Aubrey (Helen Cutter)
- Written By: Helen Raynor
- Directed By: Robert Quinn
- Ep: 35
- Episode 5
- Cast: Ciarán McMenamin (Matt Anderson), Andrew-Lee Potts (Connor Temple), Hannah Spearritt (Abby Maitland), Ben Miller (James Lester), Alexander Siddig (Philip Burton), Ben Mansfield (Captain Becker), Ruth Kearney (Jess Parker), Ruth Bradley (Emily Merchant), Janice Byrne (April Leonard), Ailbhe Casey (Jenna)
- Written By: Michael A. Walker
- Directed By: Cilla Ware
- Ep: 36
- Episode 6
- Cast: Ciarán McMenamin (Matt Anderson), Andrew-Lee Potts (Connor Temple), Hannah Spearritt (Abby Maitland), Ben Miller (James Lester), Alexander Siddig (Philip Burton), Ben Mansfield (Captain Becker), Ruth Kearney (Jess Parker), Ruth Bradley (Emily Merchant), Juliet Aubrey (Helen Cutter)
- Written By: Steve Bailie & Adrian Hodges
- Directed By: Cilla Ware
| Ciarán McMenamin ................... Matt Anderson |
| Andrew-Lee Potts ................... Connor Temple |
| Hannah Spearritt ................... Abby Maitland |
| Ben Mansfield ..................... Captain Becker |
| Ruth Kearney ......................... Jess Parker |
| Alexander Siddig ................... Philip Burton |
| Ben Miller ...................... Sir James Lester |
