Under Investigation (2021)
- Genre: Talk, Crime
- First Air Date: 2021-03-01
- Last Air Date: 2024-03-27
- Total Seasons: 6
- Total Episodes: 46
- Status: Returning Series
- Episode Runtime: 50 min.
- Production Country: Australia
- Network: Nine Network
Under Investigation will seek to solve crimes, uncover new evidence, hear from people who have never spoken publicly, while harnessing great knowledge and skill with exciting and innovative storytelling techniques.
| Title | Air Date | Duration | ||
|---|---|---|---|---|
| Season 1 | Episode 1 | High Country Mystery | 2021-03-01 | 50 min |
| Season 1 | Episode 2 | The Disappearance of Janine Vaughan | 2021-03-08 | 50 min |
| Season 1 | Episode 3 | China & The Virus | 2021-03-15 | 50 min |
| Season 1 | Episode 4 | Jaidyn Leskie - Little Boy Lost | 2021-03-22 | 50 min |
| Season 1 | Episode 5 | Putin's Poison | 2021-03-29 | 50 min |
| Season 1 | Episode 6 | The Disaster Aircraft | 2021-04-05 | 50 min |
| Season 2 | Episode 1 | Voice From The Grave: Sallie-Anne Huckstepp | 2021-08-23 | 60 min |
| Season 2 | Episode 2 | 9/11 - Year 20 | 2021-08-30 | 60 min |
| Season 2 | Episode 3 | Searching for Theo | 2021-09-06 | 60 min |
| Season 2 | Episode 4 | Murder Island | 2021-09-13 | 60 min |
| Season 2 | Episode 5 | War with China | 2021-09-20 | 60 min |
| Season 2 | Episode 6 | Girl in the Chute | 2021-09-27 | 60 min |
| Season 3 | Episode 1 | Operation London Bridge | 2022-02-09 | 60 min |
| Season 3 | Episode 2 | The Unidentified | 2022-02-16 | 60 min |
| Season 3 | Episode 3 | Curse of the High Country | 2022-02-23 | 60 min |
| Season 3 | Episode 4 | Mapping Mr Cruel | 2022-03-02 | 60 min |
| Season 3 | Episode 5 | Nuclear Reaction | 2022-03-09 | 60 min |
| Season 3 | Episode 6 | Putin the Tyrant | 2022-03-16 | 60 min |
| Season 3 | Episode 7 | The Coward Killer | 2022-03-23 | 60 min |
| Season 3 | Episode 8 | The Trump Religion | 2022-03-30 | 60 min |
| Season 4 | Episode 1 | The Cop Who Knew Too Much | 2022-09-26 | 60 min |
| Season 4 | Episode 2 | The Hate Police | 2022-10-03 | 60 min |
| Season 4 | Episode 3 | Gangs of Sydney | 2022-10-10 | 60 min |
| Season 4 | Episode 4 | The Highway | 2022-10-17 | 60 min |
| Season 4 | Episode 5 | Dark Seas | 2022-10-24 | 60 min |
| Season 4 | Episode 6 | Girls Gone | 2022-10-31 | 60 min |
| Season 4 | Episode 7 | Bad Faith | 2022-11-07 | 60 min |
| Season 4 | Episode 8 | Slug Gate | 2022-11-14 | 60 min |
| Season 5 | Episode 1 | The Man in the Hole | 2023-02-08 | 60 min |
| Season 5 | Episode 2 | Where's Willi? | 2023-02-15 | 60 min |
| Season 5 | Episode 3 | The Disgraceful Doctor Manock | 2023-02-22 | 60 min |
| Season 5 | Episode 4 | Ghost Ship | 2023-03-01 | 60 min |
| Season 5 | Episode 5 | An Excellent Murder | 2023-03-08 | 60 min |
| Season 5 | Episode 6 | Ambush | 2023-03-15 | 60 min |
| Season 5 | Episode 7 | The Hit | 2023-03-22 | 60 min |
| Season 5 | Episode 8 | The Confession | 2023-03-29 | 60 min |
| Season 5 | Episode 9 | The Last Lunch | 2023-08-23 | 65 min |
| Season 5 | Episode 10 | Secrets of Balibo | 2023-10-17 | 60 min |
| Season 6 | Episode 1 | The Snake and the Shotgun | 2024-02-07 | 60 min |
| Season 6 | Episode 2 | The Trials of Graham Stafford | 2024-02-14 | 60 min |
| Season 6 | Episode 3 | The Vanishing of Sandrine Jourdan | 2024-02-21 | 60 min |
| Season 6 | Episode 4 | The Runner | 2024-02-28 | 60 min |
| Season 6 | Episode 5 | I am the Law | 2024-03-06 | 60 min |
| Season 6 | Episode 6 | Spy Nation | 2024-03-13 | 60 min |
| Season 6 | Episode 7 | The Good Snitch | 2024-03-20 | 60 min |
| Season 6 | Episode 8 | Shots Fired | 2024-03-27 | 60 min |
| Season 6 | Episode 9 | For the Love of Eden | 2024-06-18 | 60 min |
| Season 6 | Episode 10 | Death of a Model | 2024-06-25 | 60 min |
