Arriving to earth subtly

Brainiac knew that if he came in loud and bombastically, as he usually did, it would immediately send the Last Son Of Krypton (and possibly his Super-Friends) into battle mode, so Brainiac developed a smaller ship with cloaking technology, one that could hide from even Kal-El’s detection, and set off to earth. He had used his knowledge of Krypton to develop a few ideas for his plan.

1. Disguise himself as a Kryptonian, gain Superman’s trust, and then convince him that they need to breed to repopulate the Kryptonian race. Brainiac will use nanobots to change Superman, and use Kryptonian history/religion to make her Brainiac’s ****.

2. Manufacture a synthetic pink kryptonite, and make Superman a cybernetic ****.

3. Hold Supergirl hostage, lure Superman, and later both of their mental and physical states to use control them both.

4. An alternate option