Tread Perilously begins the Christmas season with a return visit to the TARDIS for "Voyage of the Damned." After leaving Martha behind on Earth and getting a brief visit from his fifth incarnation, the Doctor crashes into the prow of the Titanic. After fixing that error, he discovers the ship is an alien vessel in Earth orbit loaded with humanoid aliens on a Christmastime cruise. But wicked business dealings lead to the ship getting hit by meteors (or is it meteoroids?). In the ensuing chaos, the Doctor must help a handful of tourists escape certain doom. He also must save Buckingham Palace from a Christmas Day calamity. Erik and Justin get confused over the definitions of meteoroid, meteorite and meteor. Erik discovers the true source of his sour feelings toward Kylie Minogue and Justin decries the notion of "timey-wimey." Both stumble when saying name "Bannakaffalatta" while a discussion of the May-December romance tendency in film leads to a consideration of the Marylin Monroe mystique. They also discover space corporations are culpable for the deaths they cause. But will "Voyage of the Damned" prove to be Justin's favorite Tennant Era Doctor Who story?