Random Fandom

ah I love this episode, probably my favorite “independent” episodes of series 4. 

yes i do classify DW episodes into three types

• independent- no major dependencies other than who the TARDIS crew is(and basic plot/tech). great for showing a friend as a sample
• supporting - little to no dependencies but are later very important to core episodes 
• core - massive dependencies you shouldn’t be allowed to see them till you  watch most supporting episodes(or at least get an over view from a friend) or have someone who has near by to pause and explain them (till series 6 it usually only was the last 2 or 3 episodes of the series)

(Source: a-torvs)