I think also the Trial of George Frankly and The Case of the Mystery Weekend. The end of the Case of the Great Car Robbery where they thought George was in the car about to be crushed was also pretty dramatic.
shareFor years The rear view terrace I never saw all the way through but I kept having dreams about it. I only saw part 1 in 1992 or what I can recall. In 1997 I got into the X-files and had dreams of this one. I'd keep thinking this MATHNET was sort of an offshoot to the X-Files only more tame and childish. Even after I had a dream where I was Kate with my leg in a plaster LLC and George rushed me out in my wheelchair just as the apartment went up in flames.
When I went to see this episode in its entirety in 2011 I remember the dream and was thinking man I'm way too serious.
Until the very end when there was only 0:01 left and I was thinking next time anyone tells me that this Mathnet is child's play, I should make them see this one.
I mean seriously.
Others that were kind of tense but not very tense as that one are.....
The VT dummy
The car robberies
The parrot one kind of freaked me a little (the bad guy was just so weird at lying)