A young engineer, Lt. Barclay, is obsessed with fantasy worlds because has problems coping with reality and the crew of the Enterprise have problems coping with him. Meanwhile, strange malfunctions start occurring on the Enterprise.

Producers: Ira Steven Behr, Hans Beimler and Richard Manning
Director: Cliff Bole
Writer: Sally Caves

Guest Cast:

Dwight Schultz (Barclay)
Charley Lang (Duffy)