The Eagle of the Ninth - Season 1 (1977)

Obsessed with discovering the fate of his father's lost legion, Marcus arrives in Britain to take command of a frontier fort. He makes friends with Cradoc, a British warrior, and all seems peaceful. Then, on the night of the full moon, the tribes rise in rebellion to attack the fort.

Badly wounded in the battle, Marcus is discharged from the legion, his soldiering at an end. He goes to recuperate with his uncle Aquila in Calleva. There he saves Esca, a British gladiator, from death in the arena, and from him he hears of the lost legion.

His wound healing after a painful operation, Marcus considers where his future now lies. A Roman commander visiting his uncle tells him of a rumour that the Caledonian tribes are about to rise and that the Eagle of the Ninth is in their hands. Marcus and Esca go north to recover it.