Mr. Fusion reactor

A Mr. Fusion reactor was a portable, small-scale power plant best known to power the DeLorean time machine's time circuits and flux capacitor. It was, in fact, a fusion reactor whose fuel was made up of garbage. One model had a power rating of at least 1.21 gigowatt (or gigawatt). (| Back to the Future, Part II)

In the continuity, Mr. Fusion reactors were Lyran-manufactured but otherwise were similar in role. The largest Mr. Fusion models could be used as an emergency power source for an unarmed Lyran cargo cutter. (: "Miracle in Whoville", "Monopolis")