"Verlorene Seelen" aka "Saving Grace" is a crossover between this series and "Promised Land".

• The first part is S05E02 here.
• The second part is the episode S03E01 from "Promised Land".

Thanks What about S04E28 - Das Weihnachtslied?

@hodel0 said:

Thanks What about S04E28 - Das Weihnachtslied?

"Das Weihnachtslied" aka "It Came Upon a Midnight Clear" was originally broadcasted on December 21, 1997 as episode S04E12.

And, before you ask, "Joe kehrt zurück" aka "The Road Home" is also a crossover between this series and "Promised Land".

• The first part is S04E01 here
• The second part is the episode S02E01 from "Promised Land".