You get the return of the Joker, Penguin, Riddler, and Catwoman (specifically modeled after Julie Newmar).
Batman frequently stops to give Robin lessons on civic duty, safety, and grammar. Batman '66 001 - 073 Extras (2013-2016).zip
The use of "Bat-Gadgets" for every possible situation (Bat-Rocket-Skis, Bat-Shark-Repellent) is in full effect. You get the return of the Joker, Penguin,
Adaptations of scripts that were written for the TV show but never filmed (most notably the Harlan Ellison story that introduced Two-Face to the '66 universe). 4. Tone and Appeal Batman '66 001 - 073 Extras (2013-2016).zip
The collection covers the entire main run of the digital chapters:
The "Extras" label in your file likely refers to several things: Annuals: Larger, self-contained stories. One-shots: Special issues focusing on specific villains.