Learning Curve

Over the following years, the Mandarin 2099 reassembled the starship's extraordinarily advanced machinery within an ancient deserted castle which she found within the Valley of Spirits, and studied the Makluan science until she had mastered it. She also learned how to use the ten rings and rebuild the starship. 

Back in America, In response, Doom's enemies banded together and under the leadership of John Herod, they briefly deposed Doom and replaced him with a man masquerading as the original Captain America. Herod then ordered the death of every inhabitant of Latveria, flooding the country with Necrotoxins which turned all organic life into a protein-rich sludge. Doom, now believed to be dead, escapes to Halo City, where he teams up with Billy Zedd, a techno-savant. Zedd rebuilds Doom's armor and creates a vat of nanomachines, which Doom sends to Washington, using the Driver. The nanomachines are released on Herod's "red house", which he built to replace the White House. His buildings collapse, his Captain is killed and Herod himself is left disabled, in pain for the rest of his natural life.