The Legend of Prince Valiant

Cynan and his elder son, Dylan, exiled from Thule, again plan against Camelot. Plotting to lure Denys (Cynan's younger son and Val's friend) away from Camelot, Dylan takes a potion made by Glyndon, Merlin's ex-protégée (and now enemy), which has put him in a state of suspended animation. The only antidote which can revive him is one Glyndon knows how to prepare.