| Canon source | Backstage source | Novel source | DITL speculation |
| # | Series | Season | Source | Comment |
| 1 | TOS | 2 | Journey to Babel | |
| 2 | Star Trek IV : The Voyage Home |
| Series : | TOS Season 2 |
| Episode : | Journey to Babel |
| Film: | Star Trek IV : The Voyage Home |
| © Graham & Ian Kennedy | Page views : 11,268 | Last updated : 14 Oct 2006 |
