Luke is mentioned, but does not appear, in the "Doctor Who" Series 4 (2008) episode "Turn Left", wherein a plot by the Trickster created an alternate reality where the Doctor is dead. Consequently, Luke, Sarah Jane, Clyde and Maria die in an alternate version of the "Doctor Who" episode "Smith and Jones". Subsequently, the "Doctor Who" Series 4 finale features Luke, Sarah Jane, Mr Smith and robot dog K9 witness a Dalek invasion of Earth. With Earth having been transported across space for use in the Daleks' "Reality Bomb", Luke assists the Tenth Doctor (David Tennant) and his associates, through web conferencing, in using the TARDIS in conjunction with Mr Smith and the Cardiff Rift to tow Earth back to its rightful place.