“Strange Planet,” the popular web comic by Nathan W. Pyle, has been expanded, by Pyle and Dan Harmon, into a television series streaming on Apple TV+. Bright, sweet and cheerful, if unusually concerned with mortality, it is, as satire, highly affectionate — keen to human frailty but understanding, hopeful, more engaged with our possibilities than our limitations.

The series centers on a race of vaguely lightbulb-shaped, barely distinguishable blue beings who, for all intents and purposes, are human beings on a planet that, for all intents and purposes, is Earth, its two moons notwithstanding. The comic is a witty commentary on a variety of human desires, habits, behaviors, strategies and pursuits, observing daily life through the filter of an “alien” language, in which the heart is a “blood pump,” parents are “lifegivers,” years are “rotations,” alcohol is “mild poison,” coffee is “jitter liquid” and a high school dance is an “adolescent limbshake.” (“Throw your hands in the air like you just don’t care” becomes “Wave your hands in the air without regard for what others are thinking.”) The formality of their speech makes it sound “scientific” in a way that recalls “SNL’s” Coneheads, minus the blank effect; the blue “beings,” as they’re called, are our temperamental doubles. (Unlike the beings, animals — “creatures,” generically, while pets are “vibrating creatures” — look just like their Earthly counterparts, except for a third eye, which is more disturbing than the fact that the beings have no pants on.)

Each of its 10 episodes explores different settings and themes — air travel, sports, fandom, friendship, fitness, quarter-life crisis, children separating from parents, wild versus domesticated animals, love.

Apart from the members of an emo-ish rock band, the Four Sensations (identified as Lonely, Fragile, Hung Up on Their Ex and Drum), none of the beings has a name, so I won’t get too particular about them or, indeed, be able to tell you which actor plays what role. (Danny Pudi, Lori Tan Chinn, Hannah Einbinder, Demi Adejuyigbe and Tunde Adebimpe are the main performers.) Characters are not overtly gendered — their pronouns are universally “they” and “them” — but in most cases, gender may be inferred. They’ve been given minor individual characteristics — a hat, a vest, tattoos, glasses, jewelry, a beauty mark, freckles, wrinkled outlines for the oldsters — to keep things dramatically clear.

Much of the action revolves around Careful Now, a restaurant perched preciously on stilts above a fog-filled abyss (no one knows exactly what’s beneath the fog). Here we meet a manager, as close as the series has to a main character; an owner; an engineer whose job it is to keep the restaurant from falling into the “crevasse”; and a customer (identified only as Table 16), who has a crush on the manager.

In a way, “Strange Planet,” whose source material has been collected into a couple of volumes, is a sort of animated children’s book for adults, replete with explicitly stated morals and lessons; we are, by necessity, lifelong lesson-learners, so the series proves useful as well as entertaining. Broadly stated, the point of the show is to love the world and its beings and creatures, and to be brave and bold, because life is fleeting and all things perish — the blue being’s favored word for die.

“The challenging moments in your life are just that … moments,” an older character tells a younger. “The bad moments will pass, even the good moments will pass, but everything you do and experience, that’s what our existence is all about.”

Tribune News Service