In his second appearance, Thanos really begins to act like the evil dude we all love to hate. He forces Super Skrull to do his bidding, kills minions with a casual thought, and tries to control the universe with the Cosmic Cube.
Interestingly, the arc ends with Drax failing and Thanos victorious.
It also ends with Captain Marvel becoming a blonde.
And as a bonus, they offer this cool diagram of Titan in Captain Marvel #27: