From the episode "Quest of the Red Skull."

Firestar is buried in a cave-in in the first two pics. After that, she flies off ahead to find the Red Skull and is ambushed with gas grenades. The Skull walks up and rolls her onto her back while monologuing, then has his henchmen put her in a "freezing support capsule" so he can gloat at her some more. Later on he straps her to a missile that he intends to use to start WW III, but Firestar breaks free, thanks to a fire arrow shot into the missile by Hiawatha Smith.

(That last bit may not have been the most well-thought-out plan ever, but hey, it worked in the cartoon.)

I also added two larger pictures that I made by resizing the screen captures, and running edge enhance and smoothing filters on them.
Source: Torrent of Region 2 DVDs