Gizmoduck returns in a new episode of DuckTales this week called The Dangerous Chemistry of Gandra Dee!
Here is a list of Gizmoduck DuckTales episodes if you want to binge watch the hero:
Season 1 Episode 11: Beware the B.U.D.D.Y System!
Season 1 Episode 18: Who is Gizmoduck?!
Season 1 Episode 23: The Shadow War!
Season 2 Episode 9: The Outlaw Scrooge McDuck!
Season 2 Episode 10: The 87 Cent Solution!
Season 2 Episode 14: The Dangerous Chemistry of Gandra Dee!
Season 2 Episode 24: Moonvasion! Part I
Season 2 Episode 25: Moonvasion! Part II
Season 3 Episode 6: Astro B.O.Y.D.!
For even more Gizmoduck action, you can also check out Issue #20 of the DuckTales comic for a great Gizmoduck story written by our friend Joe Caramagna.