| NotesImages | Galactic Barrier |
| Canon source | Backstage source | Novel source | DITL speculation |
| # | Series | Season | Source | Comment |
| 1 | TOS | 1 | Where No Man Has Gone Before | |
| 2 | TOS | 3 | Is There in Truth no Beauty? |
| Series : | TOS Season 1 |
| Episode : | Where No Man Has Gone Before |
| Series : | TOS Season 3 |
| Episode : | Is There in Truth no Beauty? |
| © Graham & Ian Kennedy | Page views : 11,507 | Last updated : 3 Apr 2014 |
