I’ve seen this episode probably three or four times, yet it always — always — manages to bring out the waterworks.  Call me a pansy, but The Ninth Doctor parting from Rose is really one of the saddest things that New-Who has ever produced.

Yes, the exchange between the Daleks and the Cybermen was quite humorous — and I particularly love how the supremacy of the Daleks as the archenemy of The Doctor was emphasized.

Cyberman: You would destroy the Cybermen with four Daleks?!

Dalek: We would destroy the Cybermen with one Dalek. You are superior in only one respect.

Cyberman: What is that?

Dalek: You are better at dying. Raise communications barrier!

But I really couldn’t care less for the confrontation between the Daleks and the Cybermen, or how The Doctor finally figured out how to send them back to where they belonged.  All that just seemed like rather superficial accessories to a more compelling and stirring narrative.  What truly made Doomsday a gem is the dynamics between Rose and The Doctor.  There she is at her bravest, and there he is at his most vulnerable.  And there they both are, choosing to make that supreme sacrifice.

In ways that you never forget your first Doctor, I guess you never forget your first companion.  The Ninth Doctor has said goodbye to an entire string of sidekicks — all played by equally amazing ladies — but nothing could ever compare to his and Rose’s farewell.  They shared an incredibly special bond that nothing in the entire universe could ever take away — a fact made so palpable by the scene where the two of them leaned up against the wall that separated their two worlds, as if sensing each other’s presence yet being painfully aware that they would never see each other again.

The Doctor’s final goodbye was just incredible.  Oh, the lengths he’d go to just to see her one last time!

Rose: Where are you?

The Doctor: Inside the TARDIS. There’s one tiny gap in the universe left, just about to close. And it takes a lot of power to send this projection. I’m in orbit around a supernova. I’m burning up a sun just to say goodbye.

The ending was bittersweet in the truest sense of the word.  Although I am deeply saddened by having to say goodbye to Rose, I recognize that in this farewell is her life coming full circle.  She now shares her life with the complete family she has always dreamt of having.  And then there is Mickey, now a better, braver man, once again by her side.  I thought it was a nice human touch to a science fiction story, to be able to show that human ties that bond are indeed one of the most potent forces in the universe.

More importantly, The Doctor succeeded in showing her ways through which she could live life better.  Rose is no longer just that ordinary, blonde chav who used to work at a shop, satisfied with living a life marked by mediocrity and routine.  She is now that somebody who aims for bigger things.  She can now dream more, do more, and be more — and there is no better place to do that than on a universe that allows her to start anew.