Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Episode | Broadcast date | Run time | Viewers (in millions) | Archive |
| --- | --- | --- | --- | --- |
| " Episode One " | 19May1973 | 25:55 | 9.2 | PAL 2" colour videotape |
| " Episode Two " | 26May1973 | 25:56 | 7.2 | PAL 2" colour videotape |
| " Episode Three " | 2June1973 | 25:12 | 7.8 | PAL 2" colour videotape |
| " Episode Four " | 9June1973 | 25:47 | 6.8 | PAL 2" colour videotape |
| " Episode Five " | 16June1973 | 25:20 | 8.3 | PAL 2" colour videotape |
| " Episode Six " | 23June1973 | 26:06 | 7.0 | PAL 2" colour videotape |
| [ dead link ] | [ dead link ] | [ dead link ] | [ dead link ] | [ dead link ] |
Question:
What episode has 7.8 million viewers?
Answer:
" Episode Three "