The series focuses on an eccentric motley crew that is the Smith family and their three housemates: Father, husband, and breadwinner Stan Smith; his better half housewife, Francine Smith; their college-aged daughter, Hayley Smith; and their high-school-aged son, Steve Smith. Outside of the Smith family, there are three additional main characters, including Hayley's boyfriend turned husband, Jeff Fischer; the family's man-in-a-goldfish-body pet, Klaus; and most notably the family's zany alien, Roger, who is "full of masquerades, brazenness, and shocking antics."

Siblings Dean and Sam crisscross the country, investigating paranormal activity and picking fights with demons, ghosts and monsters.

Jessica Day is an offbeat and adorable girl in her late 20s who, after a bad breakup, moves in with three single guys. Goofy, positive, vulnerable and honest to a fault, Jess has faith in people, even when she shouldn't. Although she's dorky and awkward, she's comfortable in her own skin. More prone to friendships with women, she's not used to hanging with the boys—especially at home.

When world-famous air racer Dusty learns that his engine is damaged and he may never race again, he must shift gears and is launched into the world of aerial firefighting. Dusty joins forces with veteran fire and rescue helicopter Blade Ranger and his team, a bunch of all-terrain vehicles known as The Smokejumpers. Together, the fearless team battles a massive wildfire, and Dusty learns what it takes to become a true hero.