Ah, another "I wasn't in Mutiny on the Bounty" movie: Two Years Before the Mast. As countless tough guy actors got their chance to play a Captain Bligh ripoff, tons of leading man actors got their chance to play a Fletcher Christian ripoff. If you want to see a perpetually shirtless Alan Ladd in the Fletcher Christian part, and Howard Da Silva in the Captain Bligh part, rent this one.
Alan is young and inexperienced, and while in a tavern, he gets knocked over the head and kidnapped to work as a crewmember on an imposing ship. Back in the 1800s, things like that did happen, and it was pretty scary. Especially since the reason the sailors needed to kidnap their crew was because their captain was so tyrannical, no one in his right mind would volunteer.
As evil as Howard Da Silva is, Alan does have one friend aboard the ship: Brian Donlevy. Ironically, if you want to see Brian as a tough captain, check out the following year's The Song of Scheherazade. Brian is sympathetic and keeps a diary of all the atrocities committed aboard the ship. William Bendix is the first mate, torn between his loyalty to his captain and the horrors he sees. Roman Bohnen, Barry Fitzgerald, Ray Collins, and Darryl Hickman can also be seen in the supporting cast. Although you can tell the quality isn't A-tier, this one is still entertaining, so you can check it out if you're an Alan Ladd fan.