1)This is the last of the "orphaned" episodes from the "Lost in Time" collections. Only Episode Two remains of this early effort from Robert Holmes.
2)Probably the only thing of interest here is the character of eccentric space miner Milo Clancey, an early example of a Holmesian whackjob, played extremely over the top.
[Part of list of Doctor Who episodes here.]
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Episode Two is available on YouTube here.