LEGO Dimensions is a “toys-to-life” video game wherein you build some LEGO and play in-game with those characters. Although, by most accounts, it was a solid game, with some of the trademark LEGO sense of fun, it was discontinued in 2017.
Although sad, this means that a lot of the existing add on packs are available at clearance prices. Many of them contain desirable mini-figs from licensed IP. In this case it’s LEGO’s own – the LEGO Movie Classic Space Man.