We've seen how villains will use entire cities as a means of making fast money. "The Drifter" uses a gravity ray to uproot the city of Good Haven, and decides he wants $10 million dollars for the city's safe return to earth. Enter the Mighty Heroes, and the predictable, ensuing chaos.
In some cases, such as this one, the episodes were split into two segments, at 5 and 3 minutes, respectively, on weeks when Mighty Mouse was the backup feature. This ensured that both features would have equal billing, a lesson Hanna-Barbera ignored with their split-feature series (i.e. Space Ghost & Dino Boy) that same season.