Episode never aired on NBC, however, after the passing of Adam West it was posted online for a limited time as a tribute to the late actor. The program was aired in New Zealand in May 2017.
Wendy returns through an evil wormhole which took her to Skartaris. This is a savage, barbarian and dinosaur infested last hidden at the Earth's core, where time operates very differently from the surface world. The Mike Grell-created land was introduced in the DC Comics title "The Warlord" in the early 1970's.
The appearance of Adam West in this chapter is his first appearance in the series since doing the voice-over narration for the Wayne Security commercial in the premier show.
The way Jackie gets her super speed is essentially the same way the Silver Age Flash, Barry Allen, got his. Being exposed to chemicals while being hit by lightning apparently yields relatively constant results.