Real-life NASA astronaut Mike Massimino appears as himself.

Tired of Sheldon’s demands? So is Leonard! 🛋️ Watch to see the roommate agreement officially hit the fan. Plus, Howard struggles to find a "cool" astronaut nickname! 👨‍🚀 Watch it here: [www.xrysoi.se/...] Option 2: Highlighting the Plot (Best for Fans)

Howard earns the unfortunate nickname "Froot Loops" instead of his preferred "Rocket Man". The Big Bang Theory: Season 5, Episode 15 | Cast and Crew