Stephen Colbert began his Late Show monologue on Wednesday with another look at Monday night's debate, focusing on Donald Trump's spat with ex-Miss Universe Alicia Machado and continued insistence he won despite the evidence, and ended it with a look at a British sperm-bank app. But he spent the middle part on Elon Musk's newly unveiled plan to transport humans to Mars by 2022 — or "halfway through Mike Pence's second term," Colbert joked, since President Trump would quit on Day 3 — at a cost of $10 billion a head. "Finally, a plan to shoot billionaires into space," Colbert said.