Review for all 4 parts:
Galaxy 4 is a four part story beginning with Four Hundred Dawns.
This is a sort of run-of-the-mill adventure where the TARDIS crew are caught up in a dispute between 2 alien races. It is well acted by the regular cast and quite neatly scripted. Overall the story is presented pretty well and has some interesting ideas such as appearances proving to be deceptive. Most aspects are done effectively enough including the representation of the leader of the Rill. Maaga, the leader of the Drahvins is reasonably good but the rest of the Drahvins are rather weak. Although the Chumblies are unimpressive creations they are quite cute robots which seem now like precursors of Star Wars cute 'droids' R2D2 and BB8 and I quite like them.
The development of the Doctor's new companions continues to create interest. Steven is one of my favourite companions and Purves' performance in the part is establishing the character really well by this stage. The way the Doctor, Steven and Vicki interact and deal with situations provides quality.
The story is no classic by any means but is a pretty well executed adventure in many respects so I am not sure why it is so disliked by many fans. It is a reasonable effort I think.
All 4 Episodes - 7/10.