The Mighty Thor vs. Ego The Living Planet!
Thor and the Rigellian Recorder have traveled into the “Bio-Verse” where they meet Ego the Living Planet. Wanting to have a dialogue with with the two visitors, Ego changes his environment to one that the two visitors find familiar, and creating a Asgardian themed Avatar to show them around, as well as give them a show of his vast powers.
Ego explains to Thor that he intends to beat Thor in combat, rationalizing if he can defeat the Thunder God, then nothing can stop him from taking over the world. Dissolving his avatar, Ego forms an army of anti-bodies to battle Thor and the Recorder. Forced with fighting these mindless drones and deal with Ego constantly shifting the planets shape. Fighting off the anti-bodies, Thor and the Recorder are then sucked into the arterized tunnels of Ego’s being.
From: Thor #133, October, 1996