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Each issue had a packet of trading cards (also available separately at newsagents) consisting of 24 pages that included the following features;
Card collection and gameplay
Website info (how to unlock areas of the website to play games and bring the 3D cards to life)
All-time top ten (cool countdowns)
Gadget's Gadgets (coolest gadgets in the universe)
Alien Slamdown (monsters head-to-head)
Episode Guide
Where's the Doctor (search and find)
A-Z of Aliens
Doctor Who Puzzles
In total, there were 52 magazines printed before the series was finished, in the main set and 6 printed for the Test Run.
Much like Battles in Time, subscribers to the partwork were given gifts. Those shown here were the magazine holder, and the swaps box which both came flat packed. There were Test Set and Main set variants of the above items which are shown below.
Below are 'clickable' covers of each of the Monster Invasion magazines, much like I have done for Battles in Time allowing them to be read should you wish.