The sketch features Tennant as the Doctor, accidentally crashing his Tardis at the "genesis of the Daleks," a reference to one of the iconic Doctor Who storylines involving the Doctor's long-standing enemies, the Daleks.
David Tennant originally played the role of the 10th Doctor in the popular TV series, and he is set to return as the 14th Doctor in three anniversary specials later this year.
The sketch also features actor Mawaan Rizwan, brainstorming a name for the newly-created Dalek before Tennant's Doctor crashes into it. The Doctor humorously expresses confusion about his current appearance, referring to his recent regeneration, and realizes that he's in the midst of the Daleks' creation.
David Tennant's return as the Doctor for Children in Need was created by Russell T Davies, who relaunched the Doctor Who series in 2005. The sketch pays homage to the show's history and delights fans with Tennant reprising his beloved role.
Children in Need is an annual fundraising event that aired on BBC One and raised £33.5 million this year to support various charities and projects benefiting disadvantaged children and young people in the UK.