Galactic Man was released by Radio Shack (and Tandy in the UK) around 1985 was was priced around $14.99. One time seen as a knock-off and nicknamed "Shackwave" it is actually an official ToyCo release. Despite this there is no mention of ToyCo on the box other than a mention that it was custom made for Radio Shack in Korea on the underside of the box.
There are similarities between Galactic Man and Shockwave suggesting they were possibly produced together at the same time. On the battery cover both have a "Made in Korea" stamping whereas the original Astro Magnum has a "Made in Japan" stamping. The copyright on the inside leg of Galactic Man and Shockwave is stamped "ToyCo Trademark 1983"; the copyright on Astro Magnum does not include the "1983".
The final difference between Galactic Man and Astro Magnum (other than a few alterations with the stickers) is the translucent plastic fist and gun hand is clear white, and not the translucent pink found on Astro Magnum.
The rubber hose on Galactic Man is more durable than Shockwaves and in my opinion the overall plastic quality has a more "premium" feel to it. Though not really noticeable, both Astro Magnum and Galactic man have a different darker shade of grey on the back of the robot / top side of gun mode.
Galactic Man is packaged in robot mode with rather drab artwork compared to the Transformers release. The box advertises 4 modes: 1) Galactic Man, 2) Anti-Aircraft Gun, 3) Vulcan Base Destroyer, 4) Handheld Laser Gun. The box also uses the same prototype artwork from the Astro Magnum box to demonstrate the various modes.
|Galactic Man mode|
|Vulcan Base Destroyer mode|
|Anti Aircraft Gun|
|Handheld Laser Gun|
Galactic Man can be obtained relatively easily and cheaply nowadays, certainly cheaper than Astro Magnum or Shockwave. With this in mind combined with how well it is made, I would highly recommend picking on up if you are a Shockwave fan.