There are three featurettes included on this DVD. The first one is just miserable (1 star). The next two are good (4 stars each). Thus, the 3 star rating.
The first 45 minute feature is "Food Soldiers: The Vikings". It was made in 1998, and the host is Richard Karn, who was from the TV show Home Improvement. The presentation is very basic, full of supposed jokes (which were never funny), used the same stock footage over and over again. The film made it very clear that Vikings never used horned helmets, but the stock footage and drawings they used to illustrate their points almost always had Vikings in horned helmets. The whole thing was treated as one big joke. If you buy the DVD, you can safely skip this one.
The second 45 minute feature is "The Vikings: Lost Worlds", where archaeologists and historians try to reconstruct some of the buildings, fortifications, ships, etc., of the Vikings based on discovered evidence. They traveled to several good museums and sites and gave a comprehensive overview of a lot of the Viking building materials, construction, and craftsmanship.
The third 45 minute feature is an episode of Warriors entitled "Viking Terror". The former Green Beret hosts the show, and he explored the different weapons and fighting techniques and strategy and tactics that the Vikings employed. He interviews some well-known and respected experts in the field, and gives it a go with using the weapons and tactics himself. Strangely, he completely ignores Viking archery, but his coverage of axes, daneaxes, throwing axes, spears, helmets, and naval combat were full of energy and information.