Dick Geary

The sight of a Medusan ambassador causes insanity.

Hyperaccelerated aliens, invisible to the naked eye, take over the Enterprise.

Kirk is confronted by one of his heroes, now criminally insane.

Kirk is forced into negotiating peace on a planet with severe class inequities.

Perry Mason is hired by a distressed girl who assumed the identity of a non-existent cousin to report her own disappearance as a suspected suicide.

An earthquake hits the area Timmy and Lassie are hiking in and the two face an additional threat from a nearby dam weakened by the quake.