I always liked the SDF-1’s Space Fold Tech because it was such an important plot point in the Robotech Saga and I’ve always thought it was more plausible than Han Solo’s space-contracting hyperdrive that somehow shrank the Kessel Run to 12 parsecs and with a better explicated mechanism than the Enterprise’s warp drive with arbitrary warp factor settings.

It is, however, unclear to me whether Space Fold Tech is a Morris-Thorne wormhole generator or an Alcubierre drive.