| Season Number: | 4 |
| Bgcolour: |
|
| Num Episodes: | 26 |
| Network: | CBS |
| Prev Season: | Season 3 |
| Next Season: | Season 5 |
| Episode List: | List of Mission: Impossible (1966 TV series) episodes |
The fourth season of the original Mission: Impossible originally aired Sundays at 10:00–11:00 pm (EST) on CBS from September 28, 1969[1] to March 29, 1970.[2]
| Character | Actor | Main | Recurring | |
| Jim Phelps | Peter Graves | Entire season | ||
| Paris | Leonard Nimoy | Entire Season | ||
| Barney Collier | Greg Morris | Entire Season | ||
| Willy Armitage | Peter Lupus | Entire Season | ||
| Tracey | Lee Meriwether | Episodes 2, 7, 9, 14-16 |
See also: List of Mission: Impossible (1966 TV series) episodes.