In the last episode:
Jack who is a researcher went on an adventure for a research and found a Ruby which while researching created a problem.

Jake: Hey Shrek wake up, wake up. What's happening? Why didn't I fall unconscious.
(Looks around for some help and finds everyone fainted)

Shrek:(Coughing) Agh!Agh!.

Jake:Shrek you woke up thank God. What is happening here. Everything is covered by red smoke and everyone except me and you now are fainted.

Shrek: The Ruby. Where is it?

Jake: It's somewhere safe.

Shrek:Put that...