I’m not disagreeing with you. Voice acting is something I thought about but never considered narration. Since I didn’t say that voice-work doesn’t count as an appearance, I don’t mind it staying.
The only reason I’d exclude it is because it’s seems hard enough to find the right answers when the actors actually do appear in the films. It almosts seems like a trick question when it’s voice only.
St. Elmo’s Fire and Oxford Blues
Somebody else please play one (mine are too controversial 
)
Ah, go ahead ShibbOleth, it’s yours fair and square. 
Nothing good in life should come easy.
Bill Murray and Chris Elliott
Groundhog Day and Kingpin
Jeff Goldblum
Geena Davis
The Fly
Earth Girls Are Easy
Ed Begley, Jr. and Christopher Guest
**A Mighty Wind
Best in Show**
The Easy One: Sissy Spacek & Piper Laurie
A Hard One (must use TV): John Gielgud and Topol
They were also both in Spinal Tap.
They were daughter and mother in Carrie… beyond that I got nothin’.
They were also in the movie version of Truman Capote’s “Grass Harp.”
If that counts as an answer… then:
Spencer Tracy & Harry Morgan
Any hints? Not that is gonna help.
My guesses would be:
The movie where Tracy plays Clarence Darrow. Drawing a blank on the name right now.
It’s a Mad, Mad, Mad, Mad World. Tracy is in that, and so is just about everybody else, so it’s possible that Morgan was also.
Some WWII flick.
Harry Morgan was the judge in “Ingerit the WInd,” which starred Tracy as a thinly disguised Clarence Darrow.
That’s the only one I know for sure.