Paco Alcacer has been pivotal in Dortmund's rise to the top.
Watch his lethal finishing qualities.
Reus: "Being top at halfway doesn't mean much"
Marco Reus says Borussia Dortmund being top at Christmas means nothing.
Watch: Alcacer and the Bundesliga's super-subs
How does Paco Alcacer score off the bench? We tell you the super-sub secret...
Bundesliga top scorer 2018/19: Who were the league's top marksmen?
bundesliga.com checks out who delighted fans with their goalscoring exploits this term.