The Time Tunnel S01E16

Doug and Tony show up in June 1215 when the Earl of Huntington is trying to convince King John to sign the Magna Carta. Doug is captured along with Huntington when the King gets surly and orders their torture. Tony manages to rescue Doug and they flee where they meet up with Huntington's men: Little John, Friar Tuck, and the Merry Men. Using their knowledge of modern-day chemicals, Doug and Tony help the rebels while trying to get hold of a homing post that the Project staff has sent back to them to enact a rescue. With the time travellers help Huntington and his men capture King John and force him to sign the Magna Carta...at Runnymede! The homing post fails to work and the two are swept off.