The Alien Parasite Hypothesis
| Episode Number | 10 |
|---|---|
| Season | 4 |
| Aired | 2010-12-09 |
| Overview | Amy finds she has sexual feelings for Penny's ex, while Koothrappali and Wolowitz try to prove who would be the better superhero. |
| Runtime | 25 minutes |
| Absolute Number | 73 |
| Finale Type |