This 7-minute video discusses the so-called Lost Gospels.
Please note that, contrary to the view you might get from this clip, I am among those who accept Q (though I respect those who do not)–it’s just discussed elsewhere in the original course, not this brief clip. (Also, I view Thomas as mid-second century but containing some authentic elements, but including gnostic elements; gnosticism in its complete forms has not been shown to predate the second century.) The larger course is found at the following site, for free: http://faculty.gordon.edu/hu/bi/ted_hildebrandt/DigitalCourses/00_DigitalBiblicalStudiesCourses.html#Matthew_Keener