|This article is not part of the Holby universe.|
|This article covers a subject that is part of the real world, and thus should not be taken as a part of the Holby universe.|
Characters from Holby City such as Guy Self, Henrik Hanssen, Jac Naylor and Xavier "Zav" Duval have made guest appearances in Casualty. In addition, Adrian "Fletch" Fletcher was previously a main character on Casualty but transferred to Holby City. This then happened again but with former main character Lofty.