Ego is a very power telepath and can create heralds like Galactus power ones to boot so I doubt Thor or Hulk would have much of a chance.
Powers of Ego from Marvel Database
The living planet Ego has been called a "bioverse." Every part of its substance, including its atmosphere, is "alive" inasmuch as it is animated and controlled by the consciousness of Ego. The exact composition of Ego is unknown, but much of the planet's surface, at least, seems to be composed of organic molecules. The planet possesses various internal features which have analogues to parts of living Earth-based organisms. For example, its interior contains tunnels which have been compared to arteries, and the center of Ego's consciousness resides in a brain-like organ deep below its surface. Ego can absorb humanoid-sized living beings into itself and "digest" them in internal areas similar to an Earth beings stomach, using its own analogues to digestive fluids. Just as an Earth organism creates one-celled antibodies to attack foreign substances in its bloodstream, Ego creates humanoid sized anti-body like beings from itself to attack intruders on or beneath its surface. In its encounters with humanoids, Ego has caused the "antibodies" to take semi humanoid form.
Ego generates vast psionic energies which, at their peak, rival those of a hungered Galactus. If Ego depletes its energy below a level that it can replenish by itself, it can help renew its energy stories by tapping outside sources, like stars, or absorbing the life forces of large numbers of living beings. At full strength Ego can use its psionic energy to obliterate starships.[1] Ego can also control its own substance psychically. Thus Ego can transform its own surface to resemble a gigantic face, to reach out into space with gigantic tendrils, or to become an idyllic world resembling the most beautiful areas of Earth. Ego can create humanoid beings with great powers out of its own surface and, it claims, command them across interstellar distances. Ego communicates with other beings telepathically. As another aspect of his psionic abilities, Ego was also able to read Thor's mind and scan his biological structure.[2]
Ego has used its great psionic powers to command the immensely powerful sidereal propulsion unit installed at its south pole by Galactus. The unit can propel Ego in and out of hyperspace at vast speeds, and apparently has virtually inexhaustible power.
Ego has been shown, in a different reality, as seen by the reality leaping Exiles, that it is able to bring out the consciousness in other planets - which it did to that reality's Earth. These 'awakened' planets are also able to command every aspect upon them, including making Anti-bodies.