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Their first potentially successful attempt to deal with their energy crisis for good was the invasion of Earth: turns out, humans are so emotionally rich that they are almost impossible to drain in one shot and given time they can recover, thus Earth is a never-ending banquet for them.Their own scientists know this is unsustainable, but few dare voice that opinion and the rare attempt at rectifying that tend to fail miserably. However, since their whole infrastructure is built on using this emotional energy, and you can only ever drain one victim once, they are forced to conquer new planets constantly.
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TV TROPES ALIEN INVASION SERIES
The Evronians from Disney's Paperinik New Adventures series use weapons that drain all emotions from a sentient victim and convert them into energy (the will-less victims are then used for menial labor), energy they then feed upon and also use as a power source.Ironically, their supposed homeworld Khera was also the result of such a seeding the Planet-Shapers there did their thing millions of years ago. Earth is one of those worlds, with a ticking Planet-Shaper under the mantle just waiting to unleash an army of superbeings (luckily it gets dismantled by Majestic). In the Wildstorm comic Majestic, it's discovered that the sufficiently advanced Kherubim seeded many worlds with Planet-Shaper Engines, which terraform the surface and allow life to evolve when that life becomes smart enough to do useful work, the Planet-Shapers will generate a flood of genetically recreated Kherubim to conquer said planet and enslave said life, thus spreading the race across the galaxy.This, along with passing on their unique genetic abilities through various lines, created the ninja clans of the present. These children defeated her when she went back on mission, and proceeded to share with the world the techniques to manipulate chakra as she had. It went off the rails on Naruto's world when an agent went rogue and decided to live as a goddess and bore hybrid children that inherited her powers. It's revealed near the end of the sequel series and the transition to the third series that there are a race of humanoids that travel to habitable worlds, planting a tree that'll suck all the life out of it so they can consume the fruit it bears to increase their own power. Naruto: It turns out that this is the origin of ninjutsu.Near the end of the series, it's revealed that Gatlantis' White Comet is actually a Planet Spaceship that is roughly the size of Saturn that has four terrestrial bodies trapped in the center, and that they plan to add Earth to their collection due to the Time Fault that the UNCF used to create the countless ships of their Wave Motion Fleet. The Gatlanteans from Space Battleship Yamato 2202 are this in that they have managed to have broken away sections of planetary crust from other planets in order to use them to cut off Terezart from the rest of the universe in a bid to try harnessing Teresa's power without having to worry about interference by outside forces.DARLING in the FRANXX: The Virm are depicted as very much so this, and have destroyed at least one prior civilization.
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In Vandread, this is true for the Earthlings, harvesting colony worlds to replace their own organs.Once peace is established with the Vajra, they willingly give up the planet and leave the galaxy for unknown reaches. At one point, one of Alto's wingmen deliberately comments "This planet is ours!" while blasting away at the local inhabitants. In Macross Frontier, due to the severe damage suffered by the Frontier fleet, and the dwindling resources (it's stated that they will last for two or three months maximum), the government decides to attack the Vajra homeworld and break through the Vajra defenses, hoping to colonize it.Dragon Ball Z: The Saiyans and their employers, the Frieza Force, regularly ravage entire worlds of their population for sale to the highest bidder.