2. Passing the Torch episode #223-224:
Tommy, Kat, Tanya and Adam pass on their powers to a new generation of Power Rangers. Introduces Cassie and T.J. to the show plus it was a cool way of having the rangers pass on their powers.
3. Chase into Space episode #249-250:
Divatox destroys the Command Center and Zord Holding Bay. Then the rangers head into space. Cool because it shows Divatox's full army and shows what she can REALLy do. Plus it set the stage for Power Rangers in Space.