A standard episode concept. Our main character who has new super powers has to cope with his newfound ability, learn to control it, and come to terms with it.
Ultimately it will solve his problem that week. Half the time it's never important again, but the other half of the time it becomes a major step forward for the character.
The discovery may be New Powers as the Plot Demands, if they're found at the exact moment when they'd be most useful, but that trope more often applies to powers the characters know about even if the audience won't.
- In the Wild Cards series, Roger Zelazny's character "The Sleeper" gets his name because every time he wakes up he has a different set of superpowers. He stays awake for a few weeks (stretching it out with meth), then sleeps for a few months, and does it again. After several years of this, he develops a routine upon waking. It goes something like, "I couldn't pick up my bed with one hand, so I knew it wasn't super-strength this time, and I cut myself shaving, so it couldn't be invulnerability. Exercising my throat only made it rasp, so I didn't have the subsonic vocalizations I had that one time either..."
- Superboy, the clone of Superman, started out with tactile telekinesis which allowed him to simulate Superman's basic Flying Brick powers and stayed this way for over a decade (real life time), but starting shortly before he joined the Teen Titans, he started picking up Superman's abilities in earnest. As of the Blackest Night series, Superboy now has all of Superman's powers having manifested freeze breath just in time to start a black lantern ring. The reason for the shift was the retconning of his origin to make him a true hybrid clone of Superman and Lex Luthor.
- Spider-Man: Tying in with the live-action film series, he was granted organic webshooters. After the events in "The Other", he developed night-vision and stingers within his body. Since One More Day, however, these abilities have been Ret-Conned away, and eventually passed onto his clone Kaine.
- Years ago, several mutants developed secondary powers well after their initial abilities had become apparent. For example, Emma Frost can turn into diamond, though it inhibits her psionic talents. In recent times, Psylocke has developed telekinesis on top of her (apparently temperamental) telepathy.
- In Buffy the Vampire Slayer Season Eight, the titular character is apparently killed in the penultimate climactic battle, only to wake up several hours later and discover that she is now a Flying Brick. By the end of the season, she is back to normal.
- A large part of the Child of the Storm series, with Harry being the main recipient (being a demigod helps in this respect, especially when your mother merged with the Phoenix, you're cousins with Jean Grey, and Doctor Strange has been arranging matters to stack the deck in your favour), albeit fairly slowly - at first, he gets some wandless magic, which mostly consists of a degree of Playing with Fire, which takes until chapter 50 to be of any use. He gets potentially vastly powerful Psychic Powers too... but until chapter 70, they're actually far more dangerous to him and those around him than they are useful. And then there's the intermittent Super Strength, which again takes a while to appear, doesn't really stray above Supersoldier levels, which is still sufficient that he's terrified he's accidentally going to squash someone's hand one day. So, yeah. As you might expect, Harry's Blessed with Suck. Once he does get the hang of it in the sequel, though, welcome to Person of Mass Destruction territory.
- Sort of half of the point of With Strings Attached. The four get magic, have to learn to use it (with varying levels of success), and keep developing new stuff, especially Paul.
- The Dresden Files: A large part of the plot of Cold Days is Harry taking his new Winter Knight powers for a spin, which includes a mind warping predatory instinct.
- Journey to Chaos: Every time Eric learns/receives new powers there is an adjustment period. In Looming Shadow it was acting like a Cloud Cuckoo Lander while his Enlightenment Superpower settled in. In Mana Mutation Menace, he struggled to come to terms with his Grendel body; the ICDMM had a laboratory and danger room for him to experiment.
- Cradle Series:
- Lindon gets quite a few, but the biggest is when he starts training in the Blackflame Path. It gives him a major power boost, making him a real contender for the first time in his life, but it's also dangerous and difficult to control. The only reason he can use it safely at all is because he has both pure madra and a major Healing Factor. When he first gains access to Blackflame, Eithan dumps him in the old training grounds that the original Blackflames used, and gives him a few months to master it.
- Yerin spends most of her time just using sword techniques, but eventually her blood shadow escapes, and she has to consume it to keep it from killing everyone. While this gives her a huge power boost (the blood shadow is basically a perfect copy of her, essentially doubling her strength), she often has to fight to bring it to heel since all it wants to do is kill.
- Smallville features this trope in spades. When the series starts Clark only had the speed, invulnerability, and strength of latter-day Superman, all at a relatively reduced level owing to his being a teen. Over the series each of his abilities (X-Ray vision, heat vision, super-hearing, telescopic/microscopic vision) has developed, some spontaneously, some as a result of a condition (i.e. hearing when he became blinded). Flight is hinted at, but it's unknown if it'll appear in the series due to the creator's "No Tights, No Flights" rule, until the finale finally showed it.
- Smallville had sexual tension linked to Clark's heat vision, temporary blindness leading to super-hearing, and super-breath manifesting in a sneeze.
- Honorable note, Clark's heat vision problems happen again when he loses his memory. Thus lost control of all his powers and had to relearn them. The same happened with his X-Ray Vision, Super Strength, and Super Speed— which all happen in a matter of hours, as opposed to the three seasons it took the first time.
- Other people, such as Lionel Luthor, have run into the heat vision problem when possessing Clark's body and/or powers.
- The Greatest American Hero was entirely based on this trope.
- The entire premise of Heroes. Quite a bit of some incarnations of X-Men too.
- The best example in Heroes which isn't as a result of power-collectors like Sylar, Peter and Arthur is when the living bomb guy (Ted) gets taught how do an EMP (by the non-powered HRG, who just somehow knows Ted can do this) in late Season 1.
- Happens in My Secret Identity at the start of the second season.
- A frequent plot-point in The Sentinel—some new aspect of Jim's heightened senses manifest itself and throws him for a loop; Blair fixes it.
- In The Flash, Barry sometimes has to practice a few times in order to get the hang of a new power (or rather, a new application of his superspeed). Notably, the episode, where he learns to leap long distances show him rather spectacularly failing, with Cisco being forced to catch him with his drones. Naturally, the episode's climax has him succeeding in leaping across a broken bridge. When Ralph learns his flexibility also allows him to shapeshift into other people (including copying their voice), he initially has trouble shifting (or even turning back into himself), but is able to perfectly imitate Clifford DeVoe by the episode's end. After Wally becomes Kid Flash, several episodes involve Barry trying to teach to him one of his tricks (such as phasing).
- In Legends of Tomorrow, Firestorm learns he/they can transmute object. However, it takes many tries before he/they can actually do it instead of simply melting the object. Initially, all he/they can transmute the target into is water (which appears to work on complex alien machinery as well, such as Thanagarian meteorites and Dominator bombs). However, near the end of Season 2, he/they transforms a stone obelisk into a pile of jelly beans.
- The 4400: Many members of the 4400 have difficulty controlling their powers when they first manifest, typically causing major problems for the people around them as well as NTAC.
- Aylee goes through this several times in Sluggy Freelance due to her species' involuntary Shapeshifting ability. Her abilities have included flight, giving off electromagnetic pulses, breathing fire, having a nearly impenetrable spell, sprouting spikes, and being over 100 feet tall. Normally acquiring a new power means losing her previous ones, though she has retained her wings through most transformations.
- The Inexplicable Adventures of Bob! plays with this when Bob briefly gains superpowers that he can't control well.
- In the Whateley Universe, this is one of the basic tropes for most everyone. The setting is the Super Hero School Whateley Academy, where mutants from all over the world go after getting their Puberty Superpower. Few of them can get the best from their powers without training, and even those with the obvious powers (Lancer has the standard flying brick package) can learn better ways to use their abilities. In particular, Lancer's back story has him having to learn to use his powers in a hurry when his brother ratted him out to the local mutant-haters on the army base, leading to a fight in which Lancer had to bust up a couple jeeps and an Abrams tank to get away.
- A large part of the Freelancer plot in Red vs. Blue was the Freelancer Agents learning to use their armor abilities and AI.
- Attempting to deal with her newfound powers in Transformers Animated, caused Sari to nearly kill Bumblebee as well as self-destruct. She reduced herself to shooting small energy blasts and using her jetpack for the rest of the series and never returned to her more superpowered state.
- The Powerpuff Girls, "Ice Sore": Blossom develops freeze breath on the hottest day of the year. But when her use of it accidentally lets some robbers make a clean getaway (freezing the robbers' getaway car, as well as the road, actually allows it to slide to safety), she vows not to use it anymore. Right after that though, her sisters literally have to beg to get her to use her ice breath against a huge fiery meteor that's about to crash into Townsville.
- Ben 10, "Big Tick": Ben, to his surprise, discovers that the Omnitrix can turn him into more than ten aliens, and becomes Cannonbolt. Cannonbolt doesn't breathe fire or shoot freeze rays from his eyes, and is likewise devoid of magnetic blasts. In addition, he has problems balancing. The form can, however, curl up into an armored ball and roll, alternately ricocheting off of things or smashing through them. When all of Ben's other forms fail to stop the immense, world-destroying Monster of the Week, Ben must, despite his initial misgivings, use this form to save the world. Cannonbolt is actually useful again a few episodes later against a recurring antagonist who had, in an earlier episode, absorbed the powers of Ben's original ten forms, and goes on to become one of Ben's more frequently-used alien forms.
- Cannonbolt also introduced the concept of Ben gaining/discovering new alien forms, which would become a regular occurrence for the rest of the franchise. In a sense, the ability to gain new powers was a new power of its own.
- Starfire of Teen Titans thinks she's becoming a monster, turns into a chrysalis, nearly gets eaten by a chrysalis-eating monster, and... comes out as her old self, but with Eye Beams.
- Freakazoid! parodied this and hung a lampshade on it in the first episode of its second season, with Freakazoid struggling to develop telekinesis because "he needs a new power".
- A constant plot element used in Danny Phantom. By the end of the show, he has the powerful ghostly wail, ice powers, and even managed to split into four (a power he's been trying to harness for months), among others.
- In Generator Rex, Rex at one point loses his nanites to Van Kliess. After being injected with new nanites, he regains his old constructs (sword, giant feet and hands, etc), as well as new, more powerful ones, this time with a blue-colored motif rather than the typical orange. An episode soon after shows him trying to better harness these newer constructs.