2x04 Momentum Deferred
First Aired: Oct. 08, 2009 on FOX
Summary: Olivia begins to regain her memories of her encounter with William Bell. Meanwhile, the "First Wave" tries to collect the head of their leader, and the traitor makes his move.
Main Characters in this Episode
Phillip Broyles: Why are shape-shifting soldiers from another universe stealing frozen heads?
- This episode features the running joke where Walter can't quite correctly recall Astrid's name. Here he calls her 'Aspirin'.
- When Agent Dunham walks out of Massive Dinamics building and meets with shape-shifter Agent Francis, The Observer may be seen in the foreground's shot.
- In the alternate universe, the hybrids are known as the First Wave. Roger R. Cross, who appears in this episode as a hybrid, was one of the regular cast members of the TV show First Wave.