This is a cute but very simple and somewhat pointless comic.  It's written by Paul Cornell, which is a fun bit of trivia, but the real attraction here is the art by Lee Sullivan.  As this story features both the Second and Seventh Doctor, Sullivan does a great job at bringing both characters and some associated companions to life in his work.  It's very impressive.

As for the story, the Doctor's old signet ring falls into the TARDIS and some wonky stuff happens.  It is quite insubstantial, but hardly an inoffensive read, either.