However, my good friend Peter Chattaway sent me a couple of links the other day relating to two other Gideon films. Firstly, and most excitingly is details on the IMDb of Gideon (1971) which stars Peter Ustinov and Jose Ferrer. Both have pedigree in biblical films and are well regarded actors in their own right. On of Ustinov's roles was as Herod the Great in Jesus of Nazareth which, incidentally also starred Gideon and Samson's Fernando Rey as Gasper. I've not been able to find out much about this film. It was a TV movie based on a successful Broadway play by Paddy Chayefsky. The director was 5 time Emmy award winner George Schaefer, who also directed a 1961 TV film called Give us Barabbas (unrelated to the Anthony Quinn film).
It's currently got 9.8 out of 10 at the IMDb, although given that it's based on a mere 9 votes that means very little. According to Wikipedia it was a "90-minute Hallmark Hall of Fame adaptation on NBC" which "aired in the United States on Friday, March 26, 1971". The play itself was reviewed by Time Magazine in 1961. You can view a photo of Ustinov in the role of Gideon at eBay at the moment as it's currently on sale.
A quick scan of Google turns up a few other minor details. According to this page, two quotes appear from the film appear at the start of Criminal Minds. Ustinov (as Gideon) says "Unfortunately, a super-abundance of dreams is paid for by a growing potential for nightmares." and Eugene Ionesco (not even in the cast list at IMDb says "Ideologies separate us. Dreams and anguish bring us together". It appears to be unavailable on DVD, and no-one seems to have loaded it up anywhere else either.
In searching for information on Gideon films, I also came across another title which at first appeared to be a separate film for sale at Amazon, and supposedly starring Sergio Ammirata and Barta Barri. No such film appears on either of their IMDb entries, and the picture on Amazon is taken from Gideon and Samson. There is quite an array of DVD releases of Gideon and Samson so it seems likely that this is simply another one of those rather than a new title.
Lastly there is the animated take on the story from Veggie Tales. Gideon Tuba Warrior was released in 2006 and is about 45 minutes long and it somehow links the story in with that of George Muller.
So that's still only four, possibly five titles for Gideon, the most promising of which may never again see the light of day. I'll hopefully find the time to watch Gideon and Samson at some point and report back.