The Angry Beavers (1997)

S2E17 Friends, Romans, Beavers!

On their journey to a nearby sports arena, Daggett irritates the bus driver, causing them to inadvertently plunge through a "hole in the fabric of space and time." The beaver brothers find themselves in ancient Rome, specifically at the Colosseum. Daggett's penchant for trouble leads them to become gladiators after he challenges numerous foes. After narrowly escaping ferocious lions and the fearsome Two-Eyed Cyclops, the beavers orchestrate a chaotic pursuit with Caesar's legion, ultimately causing mayhem throughout the city and toppling the Roman Empire!