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_”The Universe 3-D Blu-ray Set,” A&E Home Video. What better exploration to take in 3-D than the universe? This set includes a voyage back in time to investigate the violent events that shaped this solar system, including Earth. Other expeditions on this collection’s itinerary include revelations about what transformed Mars into a barren, hostile desert and how a lost moon may explain Saturn’s rings.

_”Doctor Who: Limited Edition Gift Set,” BBC America. This legendary sci-fi saga has been around for a half-century. Now here’s a collection covering the ninth, 10th and 11th Doctors (Christopher Eccleston, David Tennant and Matt Smith), with more than 70 hours of their adventures. Bonus features include three Doctor specials new to DVDs, an 11th Doctor “sonic screwdriver” gadget, art cards, and the comic book “Doctor Who at Comic-Con.”