REAPER MADNESS - The Grim Reaper has come for Bart, but Homer saves the day by "killing" him. When Homer then tries on the Grim Reaper's robe, he becomes the new Reaper and starts wreaking havoc until he's told he must kill Marge; he tricks God into thinking he's killed Marge to get out of it.
FRINKENSTEIN - Frink wins the Nobel Prize, but laments that his father didn't get to see him win it before they grew apart. The Simpsons track down Frink's long-lost father only to discover that he's dead and has been cryogenically frozen. They figure out a way to thaw him out and revive him, but once he's alert, Frink Sr. still finds a way to disappoint his son. Finally, father and son are able to make up before he expires once more - this time for good.
STOP THE WORLD, I WANT TO GOOF OFF - Bart gets his hands on a magic stopwatch that can freeze time and uses it to mischievous ends. When he breaks the watch while time is frozen, he must figure out how to bring things back to normal.