For all intents and purposes, this is a reprinting of issue #1 of this magazine, and the fifteen billionth reprinting of "The Iron Legion" and "K-9;s Finest Hour". The only difference here is that it's, strictly speaking, a reprinting of the US version of the stories, which means they're in color.
Notes: Though not credited in this printing, John Wagner was co-writer of part 5. This printing obscures the lines between parts, so it's not easy to establish from this printing alone, exactly where Wagner's bit is. This is perhaps why he gets no credit here, or in any of the reprints which collect the entire story.