Brainiac

Vril Dox,  alias Brainiac is a brilliant Coluan scientist.  He acquired a spaceship and went on a journey through space,  acquiring knowledge and using his robotic drones to capture living organisms of various alien species.

First Appearance:  Action Comics #242 (1958)
Creators:  Otto Binder,  Al Plastino
Powers:  Superhuman Strength,  Telepathy,  Telekinesis,  Enhanced Intellect

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Issues

Black entries are ongoing series
Green entries are Limited series
Red entries are One-Shots
Orange are alternate universe stories
Blue is for comments

Reading Order

Action Comics #242 – First appearance of Brainiac

Superman #167

Action Comics #544
Action Comics #545
Action Comics #546

Superman #423 – Whatever Happened to the Man of Tomorrow?

Action Comics #583

Adventures of Superman #438

Read Panic in the Sky here.

Action Comics #866
Action Comics #867
Action Comics #868
Action Comics #869
Action Comics #870

Action Comics Vol. 2 #3
Action Comics Vol. 2 #4
Action Comics Vol. 2 #5
Action Comics Vol. 2 #6
Action Comics Vol. 2 #7
Action Comics Vol. 2 #8

Supergirl Vol. 6 #23
Supergirl Vol. 6 #24

Read Superman: Doomed here.