Libby’s five choices are: 

1. Dalek (TV episode, 2005) 

2. The Empty Child / The Doctor Dances (TV episode, 2005) 

3. The Impossible Planet/The Satan Pit (TV episode, 2006) 

4. Heaven Sent (TV episode, 2015) 

5. Daleks In Manhattan/Evolution of the Daleks (TV episode, 2007).