In the Marvel Cinematic Universe, the Harvest is a collection of various DNA samples of enhanced individuals and creatures, harvested by the Skrulls on Nick Furys order. Specifically, the Harvest is a hidden collection of Avengers DNA gathered in the wake of the Battle of Earth in Avengers: Endgame. Every hero spilled blood on the battlefield in the fight against Thanos, including Captain Marvel. So, before the dust fully settled, Fury tasked Gravik and other Skrulls with finding any and all DNA so he could lock it away in a safe location. The Harvest includes DNA from heroes like Hulk, Captain Marvel, and Thor, as well as villains like Thanos and Ebony Maw. The idea behind the Harvest was to keep the DNA of the Avengers as an insurance plan in case they were ever needed again. However, the Harvest is also a dangerous weapon, as it contains the key to recreating a supersoldier serum and breeding an army that can take over the world. In the Secret Invasion series, Gravik, the villain, wants the Harvest to use it against Nick Fury and the Earth.