1: Catalyst Meet The Avatars

2: Catalyst Can Seaweed Save The World?

3: Catalyst Closing In: The Hunt For Alien Life

4: Catalyst The Day The Dinosaurs Died

5: Catalyst Heartbeat: The Miracle Inside You

6: Catalyst Death Dive: Into The Rings Of Saturn

7: Catalyst Sit Back, Relax; The Dawn Of The Driverless Car

8: Catalyst Can We Save the Reef?

9: Catalyst How To Exercise Better

10: Catalyst Gut Revolution (Part 1)

11: Catalyst Gut Revolution (Part 2) Garry's Story

12: Catalyst It's A Twin Thing

13: Catalyst The Secret To Making Better Decisions

14: Catalyst Farmer Needs A Robot

15: Catalyst Back To The Moon

16: Catalyst Gut Revolution (Part 3) Victoria's Story

17: Catalyst Sleep Matters