|Gary Lockwood||Ben Sillman|
|Peter Mark Richman||William Braden|
|Meg Foster||Paula Taylor|
|Roger Perry||Steve Lathan|
|John S. Ragin (as John Ragin)||George Wicks|
|Del Monroe||John Franklin|
|Frank Maxwell||Commander Munson, USMC|
|Ken Lynch||Avery Derek|
|Majel Barrett||Mrs. Derek|
|Lee Miller||Newsman #1|
|Noel Shier||Newsman #2|
|William Reynolds||SAC Tom Colby|
|Directed by: Walter Graumann
Written by: Calvin Clements
Production Code: 196511
233. The Animal
Original air date: 17 February 1974
Rerun 8 September 1974
A psychopathic mob enforcer escapes from a courthouse, and desperate to flee the country, will stop at nothing. He begins with the blackmail of a rich executive whom he had helped to rise from the top.
This is indeed a special episode. When it reran on 8 September 1974, it was the final network-run episode of The FBI. Peter Mark Richman makes his final appearance on the series. And, fittingly, William Reynolds makes his final appearance on the series as SAC Tom Colby.
- Star Trek Alert: Mrs. Gene Roddenberry herself, Majel Barrett, makes an appearance here! Twelve days prior to the airing of this episode, she gave birth to her son Eugene W. “Rod” Rodenberry Jr. During this same season, an animated version of Star Trek aired on Saturday mornings; it went on to win an Emmy in 1975.
- Gary Lockwood was once married to actress Stephanie Powers (The Girl From U.N.C.L.E., Hart to Hart).