Lancelot: Guardian of Time (1997) on Netflix

Plot summary

A young Arthur is meant to rule Camelot one day, and Merlin sends the knight Lancelot du Lac forward through time to keep the boy safe until then. Something goes wrong on the journey, and Lancelot and Arthur land in the present day, along with the scheming Wolvencroft and his bodyguard Blackpool. Stranded far from their own age, Lancelot searches for a way to shield the boy in a world he does not know, and finds help from two people of that time, a writer and a computer programmer. Wolvencroft has plans of his own for Arthur, and Lancelot and the two locals work to block them, with modern technology as their best hope.