The Marvel Avengers movies showed surprising range for very different characters operating in a single universe, from the outright comedy of “Thor Ragnarok” and “Guardians of the Galaxy” to the “Captain America: Winter Soldier” hark back to the political paranoia films of the 1970’s, the grappling with historical divides and cultural identity in “Black Panther” and the existential issues of “The Hulk.” But “Dark Phoenix,” this latest entry in the not (yet) integrated X-Men franchise, also based on Marvel comics, veers unwisely into a genre best left out of the superhero category: soap opera.

In this version of the X-Men universe (don’t try to tie it too closely to the original series or we would have to try to understand how Professor X and Magneto could age several decades in seven years, not to mention several other major disconnects), Jean Gray is brought by Professor X (James McAvoy) to his school, a sort of Hogwarts for mutants, when she is a child. Devastated by the loss of her parents in a car accident and terrified by powers she does not understand or control, she at first refuses. Professor X assures her that he can fix whatever she breaks, and that she herself is not broken. Note that just before the car flips over and crashes, which Jean survives without a scratch, the radio plays two significant songs: “By the Time I Get to Phoenix” and “Werewolves of London.” The first is a reference to the regenerating mythical bird that will give Jean her new nom de superhero/persona. The second is likely a nod to Jean’s relationship with Wolverine, otherwise not referred to in this film.

By the time Jean grows up (played by “Game of Thrones'” Sophie Turner), she is in a strong romantic relationship with Cyclops (Tye Sheridan) and very much a part of the group of young adult X-Men. (Raven/Mystique, played by Jennifer Lawrence, points out that the women have been saving the men so often they should consider changing the name to X-Women). The team goes on their first mission to outer space, to rescue a crew of American astronauts. Jean is almost killed, but is exposed to and possibly saved by some mysterious cosmic radiation. She says she is fine and nothing shows up in a quick medical examination, but later that day she faints, and when she is tested again, her powers are literally off the charts. As in, so far past anyone else they need to build a new machine to measure.

Whatever she has learned from the trust, guidance, and support of Professor X dissolves as the new powers bring back the same feelings of guilt, shame, defiance, and being out of control that we saw in her just before her parents’ car flipped over. She will try to find answers from her past, including a visit to the secret place where Magneto (Michael Fassbender) and his team are hanging out, a hidden safe zone that is off the grid.

As in all X-Men movies (and in last week’s “Godzilla” except with monsters), the core tension is between those who want to find a way for humans and mutants to live together in peace and mutual support (astronaut rescue!) and those who want to wipe each other out. This war seems to be going on inside of Jean, as she discovers that her real and substitute fathers lied to her and as she fears she will not be able to control her new powers.

Meanwhile, some aliens have landed and taken over human bodies. Their leader (Jessica Chastain) is searching for Jean to help them take over the planet. It is a shame to see this versatile, classically trained actor relegated to one of those roles where all of her lines are recited in the same languid but threatening monotone and her superpowers is primarily striding around in stilettos without mussing her impeccably shaped blonde hair.

The action scenes are capably staged, but the non-action scenes are close to inert and some of the special effects look cheap and insubstantial. Can we just all agree never to ask an alien character to say that emotions make humans weak? This is a disappointing placeholder that suffers by comparison with the vastly more dynamic and imaginative superhero movies we’ve already seen this year.

Parents should know that this film has extended fantasy/comic-book peril and violence with characters injured and killed and some disturbing and graphic images including characters being impaled, shot, and dissolved, and some strong language including one f-word.

Family discussion: Why did Professor X lie to Jean? Did he “fix” her? Would you like to have Jean’s powers and what would you do if you had them?

If you like this, try: the “X-Men” movies and comics and “Captain Marvel”