2-17: A Piece of the Action

Several crew members are possessed by advanced non-corporeal beings.

Dispatched to investigate the destruction of several planets, the Enterprise encounters the badly damaged U.S.S. Constellation.

The Enterprise's test of Dr. Daystrom's greatly enhanced computer becomes deadly.

The Enterprise is commandeered by members of the Kelvan empire, seeking to return to the Andromeda galaxy.

The Exeter is found drifting in space, its crew dead from a mysterious disease, except its missing captain.