I focussed on the opening scenes of The Invisible Killer for the prompt 'company of strangers' because in this we see somebody (or at least it implies) kill a Phoenix Foundation employee and then take their place on a recreational trip that MacGyver is orienteering into the wilderness as a form of stress relief. If you're unfamiliar with the episode the wall may not make sense.
I don't know why I selected this as my first square coz as an angst junkie I really struggled to think of a nice, happy, nostalgic moment. After pondering way more than I should have I settled on MacGyver and used the opening scenes of Hell Week. In this episode an old mentor of Mac's asks him (as a previous winner) to judge the annual physics competition called 'Barricade'. Of course it's never that simple and trouble ensues but I stuck to the parameters of the prompt and focussed on the one scene and resisted the temptation to play with the remainder of the episode. :D