Upon reentry, the Love Shuttle starts to burn, but then the fire simply burns out.
The animal rights activist objects to harmless experiments on bunnies, making her an unreasonable zealot rather than a young hero. Siding with her completely makes Captain Man and Kid Danger knee jerk reactionaries.
Captain Man's indestructibility shouldn't mean he'd withstand oxygen deprivation via suffocation or drowning. He'd remain physically impervious but he'd also be dead.