WordWeb Online

1. Of writing or narration; divided into or composed of episodes
   "the book is episodic and the incidents don't always hang together";
   - episodical
    
2. Occurring or appearing at usually irregular intervals
   "episodic in his affections";
   - occasional, episodical
    
3. Limited in duration to a single episode
   "an account concerned primarily with episodic events such as the succession of rulers";
   - episodical

See also: divided, impermanent, temporary, unpredictable

Encyclopedia: Episodic