My two that spring to mind would be s4's 'Home From The Sea' and s5's 'Mac's Back'.
'Home From The Sea' is just such a unique episode - no bad guys, Magnum in real peril, and you really wonder how he's gonna survive.
'Mac's Back' - when Channel 5 (UK) reran the series 2002-3, I had never seen this far down the series previously. I was off work ill for some time, and watched my recording of the episode for the first time at about 4am one morning (!). I was hooked - was this Mac's ghost or what was going on?
Anyway, as I said ONE episode, I'll go for 'Home From The Sea'. Not a typical example of the series, but one of the best.
What would yours be? You can either pick one that you think is the perfect 'showcase' for the series, or one that is very personal to you.
I'm gonna be strict here and ask for just the best, no Top 5 or Top 10s etc., that's for another thread.
