As a fan of Voyage To The Bottom Of The Sea, I must say that MAN BEAST is without doubt the best "monster" type show without being silly or fake. 1st, the episode was cleverly written to include the character of the Doctor posing as a cripple, conveying the appearance of conducting a landmark experiment, when in fact he is not wheel chair bound at all and using Captain Crane as a guinea pig to find a cure for the beast that he to is infected with. But I also feel that credit must go to the well designed makeup for David Hedison, making clever use of the old school fright wig and applied makeup, rather than a bulky and hokey head piece like in Werewolf, where you can see the actor himself and not some stunt double. The makeup coupled with Hedison's "operatic" movements, as he also performs in The Fly during the destruction of the lab, and his out cries of pain during the transformation sequences creates a very scary hour for the viewer. Leith Stevens musical score and "beast" cues adds to the eeriness by using only piano and string instruments vs. the more melodic and bombastic scores heard in the first three seasons. This may be the reason why this episode is a favorite of David Hedisons.