ET spoke with the 31-year-old via Zoom on Wednesday.
The late game show host died in November after a cancer battle.
Jennings guest hosted the game show for six weeks.
The late 'Jeopardy!' host's son is making sure his father's memory is celebrated by helping those in need.
Dr. Mehmet Oz and Dr. Sanjay Gupta will also be taking their place behind the host's lectern later this season.
As part of their appearances, a donation will be made to a charity of their choice.
'Not many things in life are perfect, but Alex did this job pretty much perfectly for more than 36 years,' the former contestant raved.
The legendary game show host died in November after a battle with pancreatic cancer. His final 'Jeopardy!' episode aired on Friday.
The legendary TV host said 'So long!' one last time on Friday.
In the show's premiere, 'The Chase' honored the late game show icon.
The 'Wheel of Fortune' stars opened up to ET about the late 'Jeopardy!' host and the new primetime version of their game show.
ET spoke with the longtime duo about the star-studded 'Celebrity Wheel of Fortune,' episodes that begin airing in primetime on Jan. 7.
Plus, Ken Jennings talks about the possibility of becoming the new host of 'Jeopardy!'
ET spoke with 'The Chase' stars Ken Jennings, James Holzhauer, Brad Rutter, and host Sara Haines ahead of its premiere Jan. 7 on ABC.
