Season opener is a glimpse of ambitious things to come.
Where it not for Susan leaving at the end of `Dalek Invasion of Earth`, that epic would surely have opened season two rather than this slight tale. `Planet of Giants` has a reputation for being quite dull though the decision to reduce it from an intended four episodes to three does move it along a bit. It is an unusual story though in that the TARDIS crew’s presence is never detected by the guest characters and though the Doctor and co do affect the outcome, they rely on guesswork to figure out the gist of what is going on.
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