Out now on 4K Blu-ray are the first four Transformers films, each in a 3-disc combo pack which includes a digital copy and a host of extras. Transformers (2007) features audio commentary from director Michael Bay, a Transformers Heads Up Display, and featurette compilations “Our World” (exploring the world of Transformers), “Their World” (examining the Autobots and Decepticons), and “More than Meets the Eye” (a look inside the desert attack scene, including concept boards), along with some Easter eggs. Transformers: Revenge of the Fallen (2009) boasts an audio commentary by Michael Bay, Roberto Orci & Alex Kurtzman along with deleted and alternate scenes, Easter eggs, and multiple featurettes (including “Deconstructing Visual Bayhem” with commentary by pre-vis supervisor Steve Yamamoto, “25 Years of Transformers”, and “The Matrix of Marketing”, among many others. Transformers: Dark of the Moon (2011) doesn’t have the audio commentary or Easter eggs featured in the previous two sets but does include multiple featurettes— notable among them are “Above and Beyond: Exploring Dark of the Moon”, “Uncharted Territory: NASA’s Future Then and Now”, and “The Art of Cybertron.” Rounding out the release is Transformers: Age of Extinction (2014), which (like Transformers: Dark of the Moon) doesn’t have audio commentary, Easter eggs, or alternate and deleted scenes. Extras on this one include the behind-the-scenes special “Evolution with Extinction: The Making of Transformers: Age of Extinction” along with some featurettes about the design of the film and the action sequences. You can find the Blu-ray 4K Combo sets of Transformers, Transformers: Revenge of the Fallen, Transformers: Dark of the Moon, and Transformers: Age of Extinction on Amazon for $19.99 each.