Browse episode ratings trends for Under Investigation. Simply click on the interactive rating graph to explore the best and worst of Under Investigation's 46 episodes.
Best Episodes of Under Investigation
Jaidyn Leskie – Little Boy Lost
S1 Ep4
7.7
22nd Mar 2021
Toddler Jaidyn Leskie was murdered in 1997 in a case that transfixed Australia. Greg Domaszewicz, who was acquitted of the killing, speaks out for the first time in more than 20 years – and our expert panel re-examines the evidence.
The Disappearance of Janine Vaughan
S1 Ep2
7.3
8th Mar 2021
Janine Vaughan was 31 when she was murdered after accepting a lift on a night out in 2001. Our panel uncovers shocking police tapes and unseen CCTV of Janine's last known moments.
Putin's Poison
S1 Ep5
7.2
29th Mar 2021
Russian President Vladimir Putin has unleashed chemical warfare on his opponents, poisoning them with deadly toxins. Our panel reveals evidence that marks him as a terrorist who puts whole communities at risk in his quest for power.
High Country Mystery
S1 Ep1
7.2
1st Mar 2021
Two ageing lovers escaped to Victoria's remote High Country to conduct their secret affair – and have never been seen again.
The Good Snitch
S6 Ep7
7.0
20th Mar 2024
Supposedly safe in witness protection, Andrew Petrelis, the star witness in a $40 million dollar drug importation is found dead. His death is deemed a tragic drug overdose.
Spy Nation
S6 Ep6
7.0
13th Mar 2024
China's authoritarian government is quietly developing AI designed to control its citizens. Liz Hayes and her team investigate just how far China's silent invasion will go.
The Snake and the Shotgun
S6 Ep1
7.0
7th Feb 2024
While searching for a snake in her garage, a devoted mother is fatally shot in the back by her husband. Liz and her team of experts examine the events surrounding that night.
Mapping Mr Cruel
S3 Ep4
7.0
2nd Mar 2022
UI re-investigates the baffling case of Melbourne's "Mr Cruel" that involved a series of child abductions and murder during the late-1980's.
Curse of the High Country
S3 Ep3
7.0
23rd Feb 2022
Following the ground-breaking investigation that examined the disappearance of elderly lovers Russell Hill and Carol Clay, from their remote campsite in Victoria's High Country.
Operation London Bridge
S3 Ep1
7.0
9th Feb 2022
"The Queen is dead, long live the King" will be the words echoed the instant Her Majesty Queen Elizabeth II passes. UI investigates The Crown in a post-Elizabeth world.
The Disaster Aircraft
S1 Ep6
7.0
5th Apr 2021
Nearly 400 people lost their lives to a design flaw in Boeing's 737 Max that caused two crashes, but the aircraft is back in the skies and Australians could soon be stepping aboard.
Worst Episodes of Under Investigation
For The Love of Eden
S6 Ep9
5.0
18th Jun 2024
The body of 15-year-old Eden Westbrook is found hanging from a tree in a public park. Liz Hayes and the panel discover serious flaws in the police investigation.
China & The Virus
S1 Ep3
5.8
15th Mar 2021
The world was told the Coronavirus leaped from animals to humans at a market in China – but many scientists now fear it leaked from a lab. Experts reveal the new research techniques that put us all at risk.
Dark Seas
S4 Ep5
6.3
24th Oct 2022
Travellers onboard cruise ships have seen violent crime, pollution, and now a COVID crisis. Liz Hayes and a panel of experts examine whether it has learnt from past lessons.
Girls Gone
S4 Ep6
6.3
31st Oct 2022
Nearly 50 years ago, 11-year-old Joanne Ratcliffe and 4-year-old Kirste Gordon were snatched from the Adelaide Oval. Groundbreaking new technology helps identify their kidnapper and reveal a shocking twist.
Where's Willi?
S5 Ep2
6.3
15th Feb 2023
Australia's first celebrity chef, star of radio and television Willi Koeppen, runs one of the country's most successful restaurants before he vanishes without a trace in 1976.
The Disgraceful Doctor Manock
S5 Ep3
6.3
22nd Feb 2023
One of the world's most unforgivable legal scandals. How South Australia's Chief Forensic Officer operated for decades with barely a qualification, providing false evidence.
Ghost Ship
S5 Ep4
6.3
1st Mar 2023
Australia's most baffling maritime mystery, the 1988 disappearance of the Patanela just 10 miles off the coast of Sydney. No distress call. No debris. All four on board lost without a trace. What really happened to the Patanela?
The Confession
S5 Ep8
6.3
29th Mar 2023
Richard Dorrough, ex-navy sailor, took his own life in 2014. He left behind a shocking note claiming to have murdered three people, but no details to identify the victims.
The Runner
S6 Ep4
6.4
28th Feb 2024
It is every family’s nightmare. A mother goes out on her regular morning jog, and never returns. In a special edition of Under Investigation on Wednesday night, Liz Hayes and a team of experts travel to the Victorian regional city of Ballarat to delve into the mysterious disappearance of 51-year-old Samantha Murphy.
Nuclear Reaction
S3 Ep5
6.5
9th Mar 2022
UI investigates Australia's delicate dance with nuclear energy, which many experts say is our only way of surviving past fossil-fuels into a carbon-free future.
Slug Gate
S4 Ep8
6.5
14th Nov 2022
After government inspectors found a slug in a Melbourne catering company's factory, a public health warning erupted into a bitter brawl between a David and a Goliath.
Under Investigation Episode Guide
High Country Mystery
S1 Ep1
7.2
1st Mar 2021
Two ageing lovers escaped to Victoria's remote High Country to conduct their secret affair – and have never been seen again.
The Disappearance of Janine Vaughan
S1 Ep2
7.3
8th Mar 2021
Janine Vaughan was 31 when she was murdered after accepting a lift on a night out in 2001. Our panel uncovers shocking police tapes and unseen CCTV of Janine's last known moments.
China & The Virus
S1 Ep3
5.8
15th Mar 2021
The world was told the Coronavirus leaped from animals to humans at a market in China – but many scientists now fear it leaked from a lab. Experts reveal the new research techniques that put us all at risk.
Jaidyn Leskie – Little Boy Lost
S1 Ep4
7.7
22nd Mar 2021
Toddler Jaidyn Leskie was murdered in 1997 in a case that transfixed Australia. Greg Domaszewicz, who was acquitted of the killing, speaks out for the first time in more than 20 years – and our expert panel re-examines the evidence.
Putin's Poison
S1 Ep5
7.2
29th Mar 2021
Russian President Vladimir Putin has unleashed chemical warfare on his opponents, poisoning them with deadly toxins. Our panel reveals evidence that marks him as a terrorist who puts whole communities at risk in his quest for power.
The Disaster Aircraft
S1 Ep6
7.0
5th Apr 2021
Nearly 400 people lost their lives to a design flaw in Boeing's 737 Max that caused two crashes, but the aircraft is back in the skies and Australians could soon be stepping aboard.
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.
No network information is available for this show.
The best rated episodes of Under Investigation are:
Jaidyn Leskie – Little Boy Lost S1E4 rated 7.7
The Disappearance of Janine Vaughan S1E2 rated 7.3
Putin's Poison S1E5 rated 7.2
High Country Mystery S1E1 rated 7.2
The Good Snitch S6E7 rated 7.0
Spy Nation S6E6 rated 7.0
The Snake and the Shotgun S6E1 rated 7.0
Mapping Mr Cruel S3E4 rated 7.0
Curse of the High Country S3E3 rated 7.0
Operation London Bridge S3E1 rated 7.0
The lowest rated episodes of Under Investigation are:
For The Love of Eden S6E9 rated 5.0
China & The Virus S1E3 rated 5.8
Dark Seas S4E5 rated 6.3
Girls Gone S4E6 rated 6.3
Where's Willi? S5E2 rated 6.3
The Disgraceful Doctor Manock S5E3 rated 6.3
Ghost Ship S5E4 rated 6.3
The Confession S5E8 rated 6.3
The Runner S6E4 rated 6.4
Nuclear Reaction S3E5 rated 6.5
The first episode of Under Investigation aired on March 01, 2021.
The last episode of Under Investigation aired on March 27, 2024.
There are 46 episodes of Under Investigation.
There are 6 seasons of Under Investigation.
Yes.
Under Investigation is set to return for future episodes.
