Playsets, or play sets, are themed collections of similar toys designed to work together to enact some action or event. The most common toy playsets involve plastic figures, accessories, and possibly buildings or scenery, purchased together in a common box. Some sets during the 1960s and 1970s were offered within metal "suitcase" containers that also functioned as part of the playset. First pioneered by metal figure manufacturers around the turn of the 20th century, usually as military "play" figures with simple accessories, the concept of the playset was further developed by companies like Marx Toys, Superior Toy, Remco, Deluxe Reading, Multiple Toymakers (MPC) and others throughout the Baby Boomer era. Several manufacturers continue to produce playsets today.